The information in this preliminary pricing supplement is not complete and may be changed.   This preliminary pricing supplement and the accompanying prospectus and prospectus supplement do not constitute an offer to sell these securities,and we are not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

Subject to Completion

Preliminary Pricing Supplement dated August 1, 2017

Preliminary Pricing Supplement (To the Prospectus dated July 18, 2016 and  the Prospectus Supplement dated July 18, 2016) Filed Pursuant to Rule 424(b)(2) Registration No. 333-212571

$[•] Phoenix Autocallable Notes due November 30, 2018 Linked to the Performance of the VanEck VectorsTM Gold Miners ETF Global Medium-Term Notes, Series A

Terms used in this preliminary pricing supplement, but not defined herein, shall have the meanings ascribed to them in the prospectus supplement.

Issuer:	Barclays Bank PLC
Denominations:	Minimum denomination of $1,000, and integral multiples of $1,000 in excess thereof
Initial Valuation Date:	August 28, 2017
Issue Date:	August 31, 2017
Final Valuation Date:*	November 27, 2018
Maturity Date:*	November 30, 2018
Reference Asset:	The VanEck VectorsTM Gold Miners ETF (Bloomberg ticker symbol “GDX UP <Equity>”)
Contingent Coupon:**	[$20.625 – $23.125 per $1,000 principal amount Note ([2.0625% - 2.3125%] of the principal amount per Note, or [8.25% - 9.25%] per annum)] If the Closing Price of the Reference Asset on any Observation Date is equal to or greater than the Coupon Barrier Price, you will receive a Contingent Coupon on the related Contingent Coupon Payment Date. If the Closing Price of the Reference Asset on any Observation Date is less than the Coupon Barrier Price, you will not receive a Contingent Coupon on the related Contingent Coupon Payment Date.
Automatic Call:	If, on any of the second, third or fourth Observation Dates, the Closing Price of the Reference Asset is equal to or greater than the Initial Price, the Notes will be automatically called for a cash payment per $1,000 principal amount Note equal to the Redemption Price. No further amounts will be payable under the Notes after the Call Settlement Date.
Payment at Maturity:	If you hold your Notes to maturity, and if your Notes are not automatically called prior to maturity, you will receive on the Maturity Date (in each case, in addition to any Contingent Coupon that may be payable on such date) a cash payment per $1,000 principal amount Note that you hold determined as follows: §If (a) the Final Price is equal to or greater than the Initial Price or (b) the Final Price is less than the Initial Price but a Knock-In Event never occurs, you will receive a payment of $1,000 per $1,000 principal amount Note §If (a) the Final Price is less than the Initial Price and (b) a Knock-In Event occurs, you will receive an amount per $1,000 principal amount Note calculated as follows: $1,000 + [$1,000 x Reference Asset Return] If (a) the Notes are not automatically called prior to maturity, (b) the Final Price is less than the Initial Price and (c) a Knock-In Event occurs, your Notes will be fully exposed to the negative performance of the Reference Asset. You may lose up to 100% of the principal amount of your Notes. Any payment on the Notes, including any Contingent Coupons and any payment upon an Automatic Call or at maturity, is not guaranteed by any third party and is subject to both the creditworthiness of the Issuer and to the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority. If Barclays Bank PLC were to default on its payment obligations or become subject to the exercise of any U.K. Bail-in Power (or any other resolution measure) by the relevant U.K. resolution authority, you might not receive any amounts owed to you under the Notes. See “Consent to U.K. Bail-in Power” and “Selected Risk Considerations” in this preliminary pricing supplement and “Risk Factors” in the accompanying prospectus supplement for more information.
Consent to U.K. Bail-in Power:	Notwithstanding any other agreements, arrangements or understandings between Barclays Bank PLC and any holder of the Notes, by acquiring the Notes, each holder of the Notes acknowledges, accepts, agrees to be bound by, and consents to the exercise of, any U.K. Bail-in Power by the relevant U.K. resolution authority. See “Consent to U.K. Bail-in Power” on page PPS-1 of this preliminary pricing supplement.

[Terms of the Notes Continue on the Next Page]

	Initial Issue Price(1)(2)	Price to Public	Agent’s Commission(3)	Proceeds to Barclays Bank PLC
Per Note	$1,000	100%	2.50%	97.50%
Total	$[·]	$[·]	$[·]	$[·]

(1)Because dealers who purchase the Notes for sale to certain fee-based advisory accounts may forego some or all selling concessions, fees or commissions, the public offering price for investors purchasing the Notes in such fee-based advisory accounts may be between $975.00 and $1,000 per Note. Investors that hold their Notes in fee-based advisory or trust accounts may be charged fees by the investment advisor or manager of such account based on the amount of assets held in those accounts, including the Notes.

(2)Our estimated value of the Notes on the Initial Valuation Date, based on our internal pricing models, is expected to be between $925.00 and $959.30 per Note.  The estimated value is expected to be less than the initial issue price of the Notes.  See “Additional Information Regarding Our Estimated Value of the Notes” on page PPS-2 of this preliminary pricing supplement.

(3)Barclays Capital Inc. will receive commissions from the Issuer of up to 2.50% of the principal amount of the Notes, or up to $25.00 per $1,000 principal amount. Barclays Capital Inc. will use these commissions to pay variable selling concessions or fees (including custodial or clearing fees) to other dealers. The actual commission received by Barclays Capital Inc. will be equal to the selling concession paid to such dealers.

Investing in the Notes involves a number of risks.  See “Risk Factors” beginning on page S-7 of the prospectus supplement and “Selected Risk Considerations” beginning on page PPS-7 of this preliminary pricing supplement.

The Notes will not be listed on any U.S. securities exchange or quotation system.  Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined that this preliminary pricing supplement is truthful or complete. Any representation to the contrary is a criminal offense.

The Notes constitute our direct, unconditional, unsecured and unsubordinated obligations and are not deposit liabilities of either Barclays PLC or Barclays Bank PLC and are not covered by the U.K. Financial Services Compensation Scheme or insured or guaranteed by the U.S. Federal Deposit Insurance Corporation or any other governmental agency of the United States, the United Kingdom or any other jurisdiction.

Terms of the Notes, Continued

Observation Dates:*	November 28, 2017, February 28, 2018, May 29, 2018, August 28, 2018 and the Final Valuation Date
Contingent Coupon Payment Dates:*	With respect to any Observation Date, the fifth Business Day after such Observation Date, provided that the Contingent Coupon Payment Date with respect to the Final Valuation Date will be the Maturity Date
Call Settlement Date:	The Contingent Coupon Payment Date following the Observation Date on which an Automatic Call occurs
Redemption Price:	$1,000 per $1,000 principal amount Note that you hold, together with the Contingent Coupon that will otherwise be payable on the applicable Call Settlement Date
Knock-In Event:***	A Knock-In Event will occur if, on any scheduled trading day during the term of the Notes, the Closing Price of the Reference Asset is less than its Barrier Price; provided that if a Market Disruption Event occurs or is continuing on such day with respect to the Reference Asset, such day will be disregarded for purposes of determining whether a Knock-In Event occurred
Closing Price:	With respect to the Reference Asset, on any date, the official closing price per share of the Reference Asset published at the regular weekday close of trading on that date as displayed on Bloomberg Professional® service page “GDX UP <Equity>” or any successor page on Bloomberg Professional® service or any successor service, as applicable
Initial Price:	$[·], the Closing Price of the Reference Asset on the Initial Valuation Date
Coupon Barrier Price:	$[·], which is 70.00% of the Initial Price, rounded to the nearest cent
Barrier Price:	$[·], which is 70.00% of the Initial Price, rounded to the nearest cent
Final Price:	The Closing Price of the Reference Asset on the Final Valuation Date
Reference Asset Return:	The performance of the Reference Asset from the Initial Price to the Final Price, calculated as follows: Final Price – Initial Price Initial Price
Calculation Agent:	Barclays Bank PLC
CUSIP/ISIN:	06744CDV0 / US06744CDV00

*Subject to postponement in the event of a Market Disruption Event, as described under “Additional Terms of the Notes” in this preliminary pricing supplement

**The actual Contingent Coupon will be determined on the Initial Valuation Date and will not be less than $20.625 per $1,000 principal amount Note, which is 2.0625% of the principal amount per Note (8.25% per annum)

***The term “Market Disruption Event” has the meaning set forth under “References Assets—Exchange-Traded Funds—Market Disruption Events for Securities with an Exchange-Traded Fund That Holds Equity Securities as a Reference Asset” in the accompanying prospectus supplement

ADDITIONAL DOCUMENTS RELATED TO OFFERING OF THE NOTES

You should read this preliminary pricing supplement together with the prospectus dated July 18, 2016, as supplemented by the prospectus supplement dated July 18, 2016 relating to our Global Medium-Term Notes, Series A, of which these Notes are a part.  This preliminary pricing supplement, together with the documents listed below, contains the terms of the Notes and supersedes all prior or contemporaneous oral statements as well as any other written materials including preliminary or indicative pricing terms, correspondence, trade ideas, structures for implementation, sample structures, brochures or other educational materials of ours.  You should carefully consider, among other things, the matters set forth under “Risk Factors” in the prospectus supplement and “Selected Risk Considerations” in this preliminary pricing supplement, as the Notes involve risks not associated with conventional debt securities.  We urge you to consult your investment, legal, tax, accounting and other advisors before you invest in the Notes.

You may access these documents on the SEC website at www.sec.gov as follows (or if such address has changed, by reviewing our filings for the relevant date on the SEC website):

·Prospectus dated July 18, 2016:

https://www.sec.gov/Archives/edgar/data/312070/000119312516650074/d219304df3asr.htm

·Prospectus Supplement dated July 18, 2016:

https://www.sec.gov/Archives/edgar/data/312070/000110465916132999/a16-14463_21424b3.htm

Our SEC file number is 1-10257.  As used in this preliminary pricing supplement, the “Company,” “we,” “us,” or “our” refers to Barclays Bank PLC.

CONSENT TO U.K. BAIL-IN POWER

Notwithstanding any other agreements, arrangements or understandings between us and any holder of the Notes, by acquiring the Notes, each holder of the Notes acknowledges, accepts, agrees to be bound by, and consents to the exercise of, any U.K. Bail-in Power by the relevant U.K. resolution authority.

Under the U.K. Banking Act 2009, as amended, the relevant U.K. resolution authority may exercise a U.K. Bail-in Power in circumstances in which the relevant U.K. resolution authority is satisfied that the resolution conditions are met. These conditions include that a U.K. bank or investment firm is failing or is likely to fail to satisfy the Financial Services and Markets Act 2000 (the “FSMA”) threshold conditions for authorization to carry on certain regulated activities (within the meaning of section 55B FSMA) or, in the case of a U.K. banking group company that is a European Economic Area (“EEA”) or third country institution or investment firm, that the relevant EEA or third country relevant authority is satisfied that the resolution conditions are met in the respect of that entity.

The U.K. Bail-in Power includes any write-down, conversion, transfer, modification and/or suspension power, which allows for (i) the reduction or cancellation of all, or a portion, of the principal amount of, interest on, or any other amounts payable on, the Notes; (ii) the conversion of all, or a portion, of the principal amount of, interest on, or any other amounts payable on, the Notes into shares or other securities or other obligations of Barclays Bank PLC or another person (and the issue to, or conferral on, the holder of the Notes such shares, securities or obligations); and/or (iii) the amendment or alteration of the maturity of the Notes, or amendment of the amount of interest or any other amounts due on the Notes, or the dates on which interest or any other amounts become payable, including by suspending payment for a temporary period; which U.K. Bail-in Power may be exercised by means of a variation of the terms of the Notes solely to give effect to the exercise by the relevant U.K. resolution authority of such U.K. Bail-in Power. Each holder of the Notes further acknowledges and agrees that the rights of the holders of the Notes are subject to, and will be varied, if necessary, solely to give effect to, the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority. For the avoidance of doubt, this consent and acknowledgment is not a waiver of any rights holders of the securities may have at law if and to the extent that any U.K. Bail-in Power is exercised by the relevant U.K. resolution authority in breach of laws applicable in England.

For more information, please see “Selected Risk Considerations—You May Lose Some or All of Your Investment If Any U.K. Bail-in Power Is Exercised by the Relevant U.K. Resolution Authority” in this preliminary pricing supplement as well as “U.K. Bail-in Power,” “Risk Factors—Risks Relating to the Securities Generally—Regulatory action in the event a bank or investment firm in the Group is failing or likely to fail could materially adversely affect the value of the securities” and “Risk Factors—Risks Relating to the Securities Generally—Under the terms of the securities, you have agreed to be bound by the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority” in the accompanying prospectus supplement.

PPS-1

ADDITIONAL INFORMATION REGARDING OUR ESTIMATED VALUE OF THE NOTES

The range of the estimated values of the Notes referenced above may not correlate on a linear basis with the Contingent Coupon range set forth in this preliminary pricing supplement.  We determined the size of such range based on prevailing market conditions, as well as the anticipated duration of the marketing period for the Notes.  The final terms for the Notes will be determined on the date the Notes are initially priced for sale to the public, which we refer to as the Initial Valuation Date, based on prevailing market conditions on or prior to the Initial Valuation Date, and will be communicated to investors either orally or in a final pricing supplement.

Our internal pricing models take into account a number of variables and are based on a number of subjective assumptions, which may or may not materialize, typically including volatility, interest rates, and our internal funding rates.  Our internal funding rates (which are our internally published borrowing rates based on variables such as market benchmarks, our appetite for borrowing, and our existing obligations coming to maturity) may vary from the levels at which our benchmark debt securities trade in the secondary market.  Our estimated value on the Initial Valuation Date is based on our internal funding rates.  Our estimated value of the Notes might be lower if such valuation were based on the levels at which our benchmark debt securities trade in the secondary market.

Our estimated value of the Notes on the Initial Valuation Date is expected to be less than the initial issue price of the Notes.  The difference between the initial issue price of the Notes and our estimated value of the Notes is expected to result from several factors, including any sales commissions expected to be paid to Barclays Capital Inc. or another affiliate of ours, any selling concessions, discounts, commissions or fees expected to be allowed or paid to non-affiliated intermediaries, the estimated profit that we or any of our affiliates expect to earn in connection with structuring the Notes, the estimated cost which we may incur in hedging our obligations under the Notes, and estimated development and other costs which we may incur in connection with the Notes.

Our estimated value on the Initial Valuation Date is not a prediction of the price at which the Notes may trade in the secondary market, nor will it be the price at which Barclays Capital Inc. may buy or sell the Notes in the secondary market. Subject to normal market and funding conditions, Barclays Capital Inc. or another affiliate of ours intends to offer to purchase the Notes in the secondary market but it is not obligated to do so.

Assuming that all relevant factors remain constant after the Initial Valuation Date, the price at which Barclays Capital Inc. may initially buy or sell the Notes in the secondary market, if any, and the value that we may initially use for customer account statements, if we provide any customer account statements at all, may exceed our estimated value on the Initial Valuation Date for a temporary period expected to be approximately six months after the Issue Date because, in our discretion, we may elect to effectively reimburse to investors a portion of the estimated cost of hedging our obligations under the Notes and other costs in connection with the Notes which we will no longer expect to incur over the term of the Notes.  We made such discretionary election and determined this temporary reimbursement period on the basis of a number of factors, which may include the tenor of the Notes and/or any agreement we may have with the distributors of the Notes.  The amount of our estimated costs which we effectively reimburse to investors in this way may not be allocated ratably throughout the reimbursement period, and we may discontinue such reimbursement at any time or revise the duration of the reimbursement period after the initial issue date of the Notes based on changes in market conditions and other factors that cannot be predicted.

We urge you to read the “Selected Risk Considerations” beginning on page PPS-7 of this preliminary pricing supplement.

You may revoke your offer to purchase the Notes at any time prior to the Initial Valuation Date.  We reserve the right to change the terms of, or reject any offer to purchase, the Notes prior to the Initial Valuation Date.  In the event of any changes to the terms of the Notes, we will notify you and you will be asked to accept such changes in connection with your purchase.  You may also choose to reject such changes in which case we may reject your offer to purchase.

PPS-2

SELECTED PURCHASE CONSIDERATIONS

The Notes are not suitable for all investors. The Notes may be a suitable investment for you if all of the following statements are true:

·You do not seek an investment that produces fixed periodic interest or coupon payments or other non-contingent sources of current income

·You understand and accept that any positive return on your investment will be limited to the Contingent Coupons that you may receive on your Notes

·You do not anticipate that a Knock-In Event will occur and you understand and accept that, if one does occur, you may lose some or all of the principal amount of your Notes

·You do not anticipate that the price of the Reference Asset will fall below the Coupon Barrier Price on any Observation Date

·You are willing to accept the risks associated with an investment linked to the performance of the Reference Asset

·You are willing to accept the risk that the Notes may be automatically called prior to scheduled maturity and that you may not be able to reinvest your money in an alternative investment with comparable risk and yield

·You do not seek an investment for which there will be an active secondary market and you are willing and able to hold the notes to maturity if the Notes are not automatically called

·You are willing to assume our credit risk for all payments on the Notes

·You are willing to consent to the exercise of any U.K. Bail-in Power by any relevant U.K. resolution authority

The Notes may not be a suitable investment for you if any of the following statements are true:

·You seek an investment that produces fixed periodic interest or coupon payments or other non-contingent sources of current income

·You seek an investment the return on which is not limited to the Contingent Coupons that may be payable on the Notes

·You anticipate that the price of the Reference Asset will decline during the term of the Notes such that its Closing Price will be than the Coupon Barrier Price on one or more Observation Dates and/or that a Knock-In Event will occur

·You are unwilling to accept the risk that, if a Knock-In Event does occur, you may lose some or all of the principal amount of your Notes

·You are unwilling or unable to accept the risks associated with an investment linked to the performance of the Reference Asset

·You are unwilling or unable to accept the risk that the Notes may be automatically called prior to scheduled maturity

·You seek an investment for which there will be an active secondary market or and/or you are unable or unwilling to hold the Notes to maturity if the Notes are not automatically called

·You are unwilling or unable to assume our credit risk for all payments on the Notes

·You are unwilling or unable to consent to the exercise of any U.K. Bail-in Power by any relevant U.K. resolution authority

You must rely on your own evaluation of the merits of an investment in the Notes.  You should reach a decision whether to invest in the Notes after carefully considering, with your advisors, the suitability of the Notes in light of your investment objectives and the specific information set out in this preliminary pricing supplement, the prospectus supplement and the prospectus. Neither the Issuer nor Barclays Capital Inc. makes any recommendation as to the suitability of the Notes for investment.

ADDITIONAL TERMS OF THE NOTES

The scheduled Observation Dates (including the Final Valuation Date), the Contingent Coupon Payment Dates, any Call Settlement Date and the Maturity Date are subject to postponement, as described under “Reference Assets—Exchange-Traded Funds—Market Disruption Events for Securities with an Exchange-Traded Fund That Holds Equity Securities as a Reference Asset” and “Terms of the Notes—Payment Dates” in the accompanying prospectus supplement.

In addition, the Reference Asset and the Notes are subject to adjustment by the Calculation Agent under certain circumstances, as described under “Reference Assets—Exchange-Traded Funds—Adjustments Relating to Securities with an Exchange-Traded Fund as a Reference Asset” in the accompanying prospectus supplement.

PPS-3

HYPOTHETICAL EXAMPLES OF AMOUNTS PAYABLE UPON AUTOMATIC CALL

The following examples demonstrate the hypothetical total return upon an automatic call under various circumstances. The “total return” as used in this preliminary pricing supplement is the number, expressed as a percentage, that results from comparing the total payments per $1,000 principal amount Note to $1,000. The hypothetical total returns set forth below are for illustrative purposes only and may not be the actual total returns applicable to a purchaser of the Notes.  The numbers appearing in the following tables and examples have been rounded for ease of analysis.  The hypothetical examples below do not take into account any tax consequences from investing in the Notes and make the following key assumption:

§Contingent Coupon: $20.625 per $1,000 principal amount Note

Example 1: The Notes are automatically called on the second Observation Date.

Observation Date	Is Closing Price Less Than Coupon Barrier Price?	Is Closing Price Less Than Initial Price?	Payment on Contingent Coupon Payment Date (per $1,000 principal amount Note)
1	No	The Notes may not be called with respect to the first Observation Date	$20.625
2	No	No	$1,020.625

Because the Closing Price of the Reference Asset on the second Observation Date (the first Observation Date on which the Notes may be called) is equal to or greater than the Initial Price, the Notes are automatically called and you will receive the Redemption Price on the related Call Settlement Date.

The Notes will cease to be outstanding after the Call Settlement Date, and you will not receive any further payments on the Notes.

The total return on investment of the Notes is 4.125%.

Example 2: The Notes are automatically called on the third Observation Date.

Observation Date	Is Closing Price Less Than Coupon Barrier Price?	Is Closing Price Less Than Initial Price?	Payment on Contingent Coupon Payment Date (per $1,000 principal amount Note)
1	Yes	The Notes may not be called with respect to the first Observation Date	$0.00
2	Yes	Yes	$0.00
3	No	No	$1,020.625

Because the Closing Price of the Reference Asset on the third Observation Date is equal to or greater than the Initial Price, the Notes are automatically called and you will receive the Redemption Price on the related Call Settlement Date.

The Notes will cease to be outstanding after the Call Settlement Date, and you will not receive any further payments on the Notes.

The total return on investment of the Notes is 2.0625%.

Each of the examples above demonstrate the return on your Notes will be limited to the Contingent Coupons that may be payable on the Notes. Each of these examples also demonstrate that a Contingent Coupon will be payable with respect to an Observation Date only if the Closing Price of the Reference Asset is equal to or greater than the Coupon Barrier Price on the relevant Observation Date. If the Closing Price of the Reference Asset is below the Coupon Barrier Price on each Observation Date, you will not receive any Contingent Coupons during the term of the Notes.

PPS-4

HYPOTHETICAL EXAMPLES OF AMOUNTS PAYABLE AT MATURITY

The following table illustrates a hypothetical range of payments that you may receive at maturity (excluding the final Contingent Coupon payment that may be payable on the Notes) under various circumstances.  The examples set forth below are purely hypothetical and are provided for illustrative purposes only.  The numbers appearing in the following table and examples have been rounded for ease of analysis.  The following examples do not take into account any tax consequences from investing in the Notes.  These examples also make the following key assumptions:

§Hypothetical Initial Price: $100.00*

§Coupon Barrier Price: $70.00 (70.00% of the hypothetical Initial Price set forth above)

§Barrier Price: $70.00 (70.00% of the hypothetical Initial Price set forth above)

§You hold your Notes to maturity and the Notes are NOT automatically called prior to maturity

* The hypothetical Initial Price of $100.00, the hypothetical Coupon Barrier Price of $70.00 and the hypothetical Barrier Price of $70.00 have been chosen for illustrative purposes only and do not represent a likely Initial Price, Coupon Barrier Price or Barrier Price. The Initial Price will be equal to the Closing Price of the Reference Asset on the Initial Valuation Date, and the Coupon Barrier Price and Barrier Price will each be equal to 70.00% of the Initial Price.

For information about recent prices per share of the Reference Asset, please see “Information Regarding the Reference Asset” in this preliminary pricing supplement.

		Payment at Maturity**
Final Price ($)	Reference Asset Return	Knock-In Event Does Not Occur	Knock-In Event Occurs
150.00	50.00%	$1,000.00	$1,000.00
140.00	40.00%	$1,000.00	$1,000.00
130.00	30.00%	$1,000.00	$1,000.00
120.00	20.00%	$1,000.00	$1,000.00
110.00	10.00%	$1,000.00	$1,000.00
100.00	0.00%	$1,000.00	$1,000.00
90.00	-10.00%	$1,000.00	$900.00
80.00	-20.00%	$1,000.00	$800.00
70.00	-30.00%	$1,000.00	$700.00
60.00	-40.00%	N/A	$600.00
50.00	-50.00%	N/A	$500.00
40.00	-60.00%	N/A	$400.00
30.00	-70.00%	N/A	$300.00
20.00	-80.00%	N/A	$200.00
10.00	-90.00%	N/A	$100.00
0.00	-100.00%	N/A	$0.00

** per $1,000 principal amount Note, excluding the final Contingent Coupon (if one is payable on the Maturity Date)

The following examples illustrate how the payments at maturity set forth in the table above are calculated:

Example 1: The price of the Reference Asset increases from an Initial Price of $100.00 to a Final Price of $110.00.

Because the Final Price of the Reference Asset is greater than the Initial Price, you will receive a payment of $1,000 per $1,000 principal amount Note that you hold, plus the Contingent Coupon that will otherwise be payable on the Maturity Date, regardless of whether a Knock-In Event ever occurred.

Example 2: The price of the Reference Asset decreases from an Initial Price of $100.00 to a Final Price of $80.00 and a Knock-In Event does NOT occur.

Although the Final Price of the Reference Asset is less than the Initial Price, because a Knock-In Event never occurs, you will receive a payment at maturity of $1,000 per $1,000 principal amount Note that you hold (plus the Contingent Coupon that will otherwise be payable on the Maturity Date).

Example 3: The price of the Reference Asset decreases from an Initial Price of $100.00 to a Final Price of $80.00 and a Knock-In Event DOES occur.

Because the Final Price of the Reference Asset is less than the Initial Price, and because a Knock-In Event occurred during the term of the Notes, you will receive a payment at maturity of $800.00 per $1,000 principal amount Note that you hold (plus the Contingent Coupon that will otherwise be payable on the Maturity Date), calculated as follows:

$1,000 + [$1,000 x Reference Asset Return]

$1,000 + [$1,000 x -20.00%] = $800.00

PPS-5

Example 4: The price of the Reference Asset decreases from an Initial Price of $100.00 to a Final Price of $50.00, resulting in the occurrence of a Knock-In Event on the Final Valuation Date.

Because the Final Price is less than the Barrier Price, a Knock-In Event occurs on the Final Valuation Date, regardless of whether a Knock-In Event occurred on any other day during the term of the Notes. Because the Final Price is less than the Initial Price, and because a Knock-In Event occurred during the term of the Notes, you will receive a payment at maturity of $500.00 per $1,000 principal amount Note that you hold, calculated as follows:

$1,000 + [$1,000 x Reference Asset Return]

$1,000 + [$1,000 x -50.00%] = $500.00

In addition, because the Final Price is less than the Coupon Barrier Price, you will not receive a Contingent Coupon on the Maturity Date.

Examples 3 and 4 above demonstrate that, if (a) your Notes are not automatically called prior to maturity, (b) the Final Price is less than the Initial Price and (c) a Knock-In Event occurs, your investment in the Notes will be fully exposed to the negative performance of the Reference Asset.

If your Notes are not automatically called prior to maturity, you may lose up to 100% of the principal amount of your Notes.

PPS-6

SELECTED RISK CONSIDERATIONS

An investment in the Notes involves significant risks.  Investing in the Notes is not equivalent to investing directly in the Reference Asset or the components of its underlying index.  These risks are explained in more detail in the “Risk Factors” section of the prospectus supplement, including the risk factors discussed under the following headings of the prospectus supplement:

·“Risk Factors—Risks Relating to the Securities Generally”; and

·“Risk Factors—Additional Risks Relating to Securities with Reference Assets That Are Equity Securities, Indices of Equity Securities or Exchange-Traded Funds that Hold Equity Securities”.

In addition to the risks described above, you should consider the following:

·Your Investment in the Notes May Result in a Significant Loss—If (a) the Notes are not automatically called prior to maturity, (b) the Final Price is less than the Initial Price and (c) a Knock-In Event occurs at any time during the term of the Notes, your investment will be fully exposed to the negative performance of the Reference Asset.  You may lose up to 100% of the principal amount of your Notes.

·Potential Return Limited to the Contingent Coupons—The positive return on the Notes is limited to the Contingent Coupons, if any, that may be payable during the term of the Notes.  You will not participate in any appreciation in the value of the Reference Asset and you will not receive more than the principal amount of your Notes at maturity (plus a Contingent Coupon if one is payable in respect of the Final Valuation Date) even if the Reference Asset Return is positive.

Based on the stated term of the Notes, assuming the Contingent Coupon is set at $20.625 per $1,000 principal amount Note, the maximum amount of Contingent Coupons that you may receive is $103.125 per $1,000 principal amount Note (or 10.3125% of the principal amount of your Notes). You will receive this maximum amount of Contingent Coupons only if (a) the Closing Price of the Reference Asset on each Observation Date equals or exceeds the Coupon Barrier Price and (b) an Automatic Call never occurs. The actual amount of Contingent Coupons that you receive may be substantially less than this amount, and may be as low as zero (as described immediately below).

·You May Not Receive any Contingent Coupon Payments on the Notes—You will receive a Contingent Coupon on a Contingent Coupon Payment Date only if the Closing Price of the Reference Asset on the related Observation Date is equal to or greater than the Coupon Barrier Price. If the Closing Price of the Reference Asset on an Observation Date is less than the Coupon Barrier Price, you will not receive a Contingent Coupon on the related Contingent Coupon Payment Date. If the Closing Price of the Reference Asset is less than the Coupon Barrier Price on each Observation Date, you will not receive any Contingent Coupons during the term of the Notes.

·The Notes are Subject to Volatility Risk—Volatility is a measure of the magnitude of the movements of the price of an asset over a period of time. The Contingent Coupon will be determined on the Initial Valuation Date based on a number of factors, including the expected volatility of the Reference Asset. The Contingent Coupon will be higher than the fixed rate that we would pay on a conventional debt security of the same tenor and will be higher than it otherwise would have been had the expected volatility of the Reference Asset, calculated as of the Initial Valuation Date, been lower. As volatility of the Reference Asset increases, there will typically be a greater likelihood that (a) the Closing Price of the Reference Asset on one or more Observation Dates will be less than the Coupon Barrier Price and (b) a Knock-In Event will occur.

Accordingly, you should understand that the Contingent Coupon will reflect, among other things, an indication of a greater likelihood that you will (a) not receive Contingent Coupons with respect to one or more Observation Dates and/or (b) incur a loss of principal at maturity than would have been the case had the Contingent Coupon been lower. In addition, actual volatility over the term of the Notes may be significantly higher than expected volatility at the time the terms of the Notes were determined. If actual volatility is higher than expected, you will face an even greater risk that you will not receive Contingent Coupons and/or that you will lose some or all of your principal at maturity for the reasons described above

·Potential Early Exit—While the original term of the Notes is as indicated on the cover of this preliminary pricing supplement, the Notes will be automatically called if the Closing Price of the Reference Asset on any of the second, third or fourth Observation Dates is equal to or greater than the Initial Price.  Accordingly, the term of the Notes may be as short as approximately six months.

The Redemption Price that you receive on a Call Settlement Date, together with any Contingent Coupons that you may have received on prior Contingent Coupon Payment Dates, may be less than the aggregate amount of payments that you would have received had you held your Notes to maturity. You may not be able to reinvest any amounts received on the Call Settlement Date in a comparable investment with similar risk and yield. No interest or call premium will accrue or be payable after the relevant Call Settlement Date.  The “automatic call” feature may also adversely impact your ability to sell your Notes and the price at which they may be sold.

·If Your Notes are not Automatically Called Prior to Maturity, the Payment at Maturity is not Based on the Price of either Reference Asset at any Time Other than the Closing Price on the Final Valuation Date—The Final Price and Reference Asset Return will be based solely on the Closing Price of the Reference Asset on the Final Valuation Date.  Accordingly, if the price of the Reference Asset drops on the Final Valuation Date, the payment at maturity that you will receive may be significantly less than it would have been had your payment at maturity been linked to the price of the Reference Asset at a time prior to such drop.

PPS-7

·Whether or Not the Notes Will be Automatically Called Prior to Will Not be Based on the Price of the Reference Asset at Any Time Other than the Closing Price on the Applicable Observation Date—Whether or not the Notes are automatically called will be based solely on the Closing Price of the Reference Asset on each Observation Date in respect of which the Notes may be called.  Accordingly, if the price of the Reference Asset drops on any such Observation Date such that the Closing Price on such day falls below the Initial Price, your Notes will not be called on the relevant Observation Date.

·Credit of Issuer—The Notes are senior unsecured debt obligations of the issuer, Barclays Bank PLC and are not, either directly or indirectly, an obligation of any third party.  Any payment to be made on the Notes, including any Contingent Coupons and any payment upon an Automatic Call or at maturity, is subject to the ability of Barclays Bank PLC to satisfy its obligations as they come due and is not guaranteed by any third party.  In the event Barclays Bank PLC were to default on its obligations, you may not receive any amounts owed to you under the terms of the Notes.

·You May Lose Some or All of Your Investment If Any U.K. Bail-in Power Is Exercised by the Relevant U.K. Resolution Authority—Notwithstanding any other agreements, arrangements or understandings between Barclays Bank PLC and any holder of the Notes, by acquiring the Notes, each holder of the Notes acknowledges, accepts, agrees to be bound by, and consents to the exercise of, any U.K. Bail-in Power by the relevant U.K. resolution authority as set forth under “Consent to U.K. Bail-in Power” in this preliminary pricing supplement. Accordingly, any U.K. Bail-in Power may be exercised in such a manner as to result in you and other holders of the Notes losing all or a part of the value of your investment in the Notes or receiving a different security from the Notes, which may be worth significantly less than the Notes and which may have significantly fewer protections than those typically afforded to debt securities. Moreover, the relevant U.K. resolution authority may exercise the U.K. Bail-in Power without providing any advance notice to, or requiring the consent of, the holders of the Notes. The exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority with respect to the Notes will not be a default or an Event of Default (as each term is defined in the indenture) and the trustee will not be liable for any action that the trustee takes, or abstains from taking, in either case, in accordance with the exercise of the U.K. Bail-in Power by the relevant U.K. resolution authority with respect to the Notes. See “Consent to U.K. Bail-in Power” in this preliminary pricing supplement as well as “U.K. Bail-in Power,” “Risk Factors—Risks Relating to the Securities Generally—Regulatory action in the event a bank or investment firm in the Group is failing or likely to fail could materially adversely affect the value of the securities” and “Risk Factors—Risks Relating to the Securities Generally—Under the terms of the securities, you have agreed to be bound by the exercise of any U.K. Bail-in Power by the relevant U.K. resolution authority” in the accompanying prospectus supplement.

·No Dividend Payments or Voting Rights—As a holder of the Notes, you will not have voting rights or rights to receive cash dividends or other distributions or other rights that holders of the Reference Asset or the securities held in the Reference Asset’s portfolio  would have.

·Historical Performance of the Reference Assets Should Not Be Taken as Any Indication of the Future Performance of the Reference Asset Over the Term of the Notes—The price of the Reference Asset has fluctuated in the past and may, in the future, experience significant fluctuations. The historical performance of the Reference Asset is not an indication of the future performance of the Reference Asset over the term of the Notes.  Therefore, the performance of the Reference Asset over the term of the Notes may bear no relation or resemblance to the historical performance of the Reference Asset.

·Certain Features of Exchange-Traded Funds Will Impact the Value of the Reference Asset and the Value of the Notes:

oManagement Risk.  This is the risk that the investment strategy for the Reference Asset, the implementation of which is subject to a number of constraints, may not produce the intended results.  An investment in an exchange-traded fund involves risks similar to those of investing in any fund of equity securities traded on an exchange, such as market fluctuations caused by such factors as economic and political developments, changes in interest rates and perceived trends in security prices.  Because, however, the Reference Asset is not “actively” managed, it generally does not take defensive positions in declining markets and generally will not sell a security if the issuer of such security was in financial trouble. Accordingly, the performance of the Reference Asset could be lower than other types of mutual funds that may actively shift their portfolio assets to take advantage of market opportunities or to lessen the impact of a market decline.

oDerivatives Risk.  The Reference Asset may invest in futures contracts, options on futures contracts, other types of options and swaps and other derivatives.  A derivative is a financial contract, the value of which depends on, or is derived from, the value of an underlying asset such as a security or an index.  Compared to conventional securities, derivatives can be more sensitive to changes in interest rates or to sudden fluctuations in market prices, and thus the Reference Asset’s losses, and, as a consequence, the losses on your Notes, may be greater than if the Reference Asset invested only in conventional securities.

oTracking and Underperformance Risk (Particularly in Periods of Market Volatility). The performance of the Reference Asset may not replicate the performance of, and may underperform, its underlying index.  The Reference Asset will reflect transaction costs and fees that will reduce its relative performance.

Moreover, it is also possible that the Reference Asset may not fully replicate or may, in certain circumstances, diverge significantly from the performance of its underlying index due to differences in trading hours between the Reference Asset and its underlying index or due to other circumstances. During periods of market volatility, securities underlying the Reference Asset may be unavailable in the secondary market, market participants may be unable to calculate accurately the intraday net asset value per share of the Reference Asset and the liquidity of the Reference Asset may be adversely affected. This kind of market volatility may also disrupt the ability of market participants to create and redeem shares in the Reference Asset. Further, market volatility may adversely affect, sometimes materially, the prices at which market participants are willing to buy and sell shares of the Reference Asset. As a result, under these circumstances, the market value of the

PPS-8

Reference Asset may vary substantially from the net asset value per share of the Reference Asset. This variation in performance is called “tracking error” and, at times, the tracking error may be significant.

·The Notes are Subject to Risks Associated with the Gold Mining Industry—The Reference Asset generally invests substantially all of its assets in securities of companies involved in the gold mining industry. As a result, the stocks that will, under normal market conditions, determine the performance of the Reference Asset are generally concentrated in one industry. By investing in the Notes, you will not benefit from the diversification which could result from an investment linked to companies that operate in multiple sectors.

The performance of companies that operate in the gold mining industry is subject to a number of complex and unpredictable factors such as industry competition, fluctuations in the market price of gold, government action and regulation, geopolitical events and supply and demand for the products and services offered by such companies. Negative developments in the gold mining industry may have a negative effect on the Reference Asset and, in turn, may have an adverse effect on the value of the Notes.

·The Notes are Subject to Risks Associated with Non-U.S. Securities Markets—Some of the securities held in the Reference Asset’s portfolio may be issued by non-U.S. issuers. Securities issued by non-U.S. companies in non-U.S. securities markets may be more volatile and may be subject to different political, market, economic, exchange rate, regulatory and other risks than securities issued by U.S. companies, which may have a negative impact on the performance of the financial products directly or indirectly linked to such securities, including the Notes.  The public availability of information concerning the issuers of such securities will vary depending on their home jurisdiction and the reporting requirements imposed by their respective regulators.  In addition, the issuers of these securities may be subject to accounting, auditing and financial reporting standards and requirement that differ from those applicable to United States reporting companies.

·The Notes are Subject to Currency Exchange Rate Risk—Some of the securities held in the Reference Asset’s portfolio may be issued non-U.S. companies and may trade in non-U.S. currencies. Because the price of the Reference Asset will be affected the U.S. dollar value of any non-U.S. equity securities held in its portfolio, you will be exposed to the currency exchange rate risk with respect to each of the currencies in which such underlying securities trade. Currency exchange rates may be subject to a high degree of fluctuation based on a number of complex and unpredictable factors. Your net exposure will depend on the extent to which the currencies of the non-U.S. securities held by the Reference Asset strengthen or weaken against the U.S. dollar and the relative weight those securities in the Reference Asset’s portfolio. If, taking into account that weighting, the dollar strengthens against the currencies of such securities, the value of that Reference Asset’s portfolio will be adversely affected, which is expected to have an adverse effect on the price per share of the Reference Asset, which may have a negative effect on the payment at maturity on your Notes.

·The Price of the Reference Asset May be Affected by the Performance of a Small Number of Companies—As of July 26, 2017, approximately 20.5% of the Gold Miners ETF’s portfolio consisted of the stocks of only two companies and approximately 54.8% consisted of the stocks of only eight companies. The performance of the Reference Asset will be more significantly affected by the performance of these companies than would a more diversified pool of assets. Negative developments with respect to a small number of companies that account for a significant portion of the Reference Asset’s portfolio may have a significant adverse effect on the value of the Reference Asset and, accordingly, on the value of your Notes.

·The Estimated Value of Your Notes is Expected to be Lower Than the Initial Issue Price of Your Notes—The estimated value of your Notes on the Initial Valuation Date is expected to be lower, and may be significantly lower, than the initial issue price of your Notes.  The difference between the initial issue price of your Notes and the estimated value of the Notes is expected as a result of certain factors, such as any sales commissions expected to be paid to Barclays Capital Inc. or another affiliate of ours, any selling concessions, discounts, commissions or fees expected to be allowed or paid to non-affiliated intermediaries, the estimated profit that we or any of our affiliates expect to earn in connection with structuring the Notes, the estimated cost which we may incur in hedging our obligations under the Notes, and estimated development and other costs which we may incur in connection with the Notes.

·The Estimated Value of Your Notes Might be Lower if Such Estimated Value Were Based on the Levels at Which Our Debt Securities Trade in the Secondary Market—The estimated value of your Notes on the Initial Valuation Date is based on a number of variables, including our internal funding rates.  Our internal funding rates may vary from the levels at which our benchmark debt securities trade in the secondary market.  As a result of this difference, the estimated values referenced above might be lower if such estimated values were based on the levels at which our benchmark debt securities trade in the secondary market.

·The Estimated Value of the Notes is Based on Our Internal Pricing Models, Which May Prove to be Inaccurate and May be Different from the Pricing Models of Other Financial Institutions—The estimated value of your Notes on the Initial Valuation Date is based on our internal pricing models, which take into account a number of variables and are based on a number of subjective assumptions, which may or may not materialize.  These variables and assumptions are not evaluated or verified on an independent basis. Further, our pricing models may be different from other financial institutions’ pricing models and the methodologies used by us to estimate the value of the Notes may not be consistent with those of other financial institutions which may be purchasers or sellers of Notes in the secondary market.  As a result, the secondary market price of your Notes may be materially different from the estimated value of the Notes determined by reference to our internal pricing models.

PPS-9

·The Estimated Value of Your Notes Is Not a Prediction of the Prices at Which You May Sell Your Notes in the Secondary Market, if any, and Such Secondary Market Prices, If Any, Will Likely be Lower Than the Initial Issue Price of Your Notes and Maybe Lower Than the Estimated Value of Your Notes—The estimated value of the Notes will not be a prediction of the prices at which Barclays Capital Inc., other affiliates of ours or third parties may be willing to purchase the Notes from you in secondary market transactions (if they are willing to purchase, which they are not obligated to do).  The price at which you may be able to sell your Notes in the secondary market at any time will be influenced by many factors that cannot be predicted, such as market conditions, and any bid and ask spread for similar sized trades, and may be substantially less than our estimated value of the Notes.  Further, as secondary market prices of your Notes take into account the levels at which our debt securities trade in the secondary market, and do not take into account our various costs related to the Notes such as fees, commissions, discounts, and the costs of hedging our obligations under the Notes, secondary market prices of your Notes will likely be lower than the initial issue price of your Notes.  As a result, the price, at which Barclays Capital Inc., other affiliates of ours or third parties may be willing to purchase the Notes from you in secondary market transactions, if any, will likely be lower than the price you paid for your Notes, and any sale prior to the maturity date could result in a substantial loss to you.

·The Temporary Price at Which We May Initially Buy The Notes in the Secondary Market And the Value We May Initially Use for Customer Account Statements, If We Provide Any Customer Account Statements At All, May Not Be Indicative of Future Prices of Your Notes—Assuming that all relevant factors remain constant after the Initial Valuation Date, the price at which Barclays Capital Inc. may initially buy or sell the Notes in the secondary market (if Barclays Capital Inc. makes a market in the Notes, which it is not obligated to do) and the value that we may initially use for customer account statements, if we provide any customer account statements at all, may exceed our estimated value of the Notes on the Initial Valuation Date, as well as the secondary market value of the Notes, for a temporary period after the initial issue date of the Notes.  The price at which Barclays Capital Inc. may initially buy or sell the Notes in the secondary market and the value that we may initially use for customer account statements may not be indicative of future prices of your Notes.

·We and Our Affiliates’  May Engage in Various Activities or Make Determinations That Could Materially Affect the Notes in Various Ways and Create Conflicts of Interest—We and our affiliates play a variety of roles in connection with the issuance of the Notes, as described below. In performing these roles, our and our affiliates’ economic interests are potentially adverse to your interests as an investor in the Notes.

We and our affiliates make markets in and trade various financial instruments or products for our accounts and for the account of our clients and otherwise provide investment banking and other financial services with respect to these financial instruments and products. These financial instruments and products may include securities, derivative instruments or assets that may relate to the Reference Asset or its components. In any such market making, trading and hedging activity, and other services, we or our affiliates may take positions or take actions that are inconsistent with, or adverse to, the investment objectives of holders of the Notes. We and our affiliates have no obligation to take the needs of any buyer, seller or holder of the Notes into account in conducting these activities. Such market making, trading and hedging activity, investment banking and other financial services may negatively impact the value of the Notes.

In addition, the role played by Barclays Capital Inc., as the agent for the Notes, could present significant conflicts of interest with the role of Barclays Bank PLC, as issuer of the Notes.  For example, Barclays Capital Inc. or its representatives may derive compensation or financial benefit from the distribution of the Notes. Furthermore, we and our affiliates establish the offering price of the Notes for initial sale to the public, and the offering price is not based upon any independent verification or valuation.

In addition to the activities described above, we will also act as the Calculation Agent for the Notes.  As Calculation Agent, we will determine any values of the Reference Asset and make any other determinations necessary to calculate any payments on the Notes. In making these determinations, we may be required to make certain discretionary judgments relating to the Reference Asset and the Notes. In making these discretionary judgments, our economic interests are potentially adverse to your interests as an investor in the Notes, and any of these determinations may adversely affect any payments on the Notes.

·Lack of Liquidity—The Notes will not be listed on any securities exchange.  Barclays Capital Inc. and other affiliates of Barclays Bank PLC intend to make a secondary market for the Notes but are not required to do so, and may discontinue any such secondary market making at any time, without notice.  Barclays Capital Inc. may at any time hold unsold inventory, which may inhibit the development of a secondary market for the Notes. Even if there is a secondary market, it may not provide enough liquidity to allow you to trade or sell the Notes easily.  Because other dealers are not likely to make a secondary market for the Notes, the price at which you may be able to trade your Notes is likely to depend on the price, if any, at which Barclays Capital Inc. and other affiliates of Barclays Bank PLC are willing to buy the Notes. The Notes are not designed to be short-term trading instruments.  Accordingly, you should be able and willing to hold your Notes to maturity.

·Taxes—The U.S. federal income tax treatment of the Notes is uncertain and the Internal Revenue Service could assert that the Notes should be taxed in a manner that is different than described below.  As discussed further in the accompanying prospectus supplement, the Internal Revenue Service issued a notice in 2007 indicating that it and the Treasury Department are actively considering whether, among other issues, you should be required to accrue interest over the term of an instrument such as the Notes and whether all or part of the gain you may recognize upon the sale, redemption or maturity of an instrument such as the Notes should be treated as ordinary income.  Similarly, the Internal Revenue Service and the Treasury Department have current projects open with regard to the tax treatment of pre-paid forward contracts and contingent notional principal contracts.  While it is impossible to anticipate how any ultimate guidance would affect the tax treatment of instruments such as the Notes (and while

PPS-10

any such guidance may be issued on a prospective basis only), such guidance could be applied retroactively and could in any case (i) require you to accrue income in respect of the Notes even if you do not receive any payments with respect to the Notes until redemption or maturity and (ii) require you to accrue income in respect of the Notes in excess of any Contingent Coupons received on the Notes.  The outcome of this process is uncertain.  In addition, any character mismatch arising from your inclusion of ordinary income in respect of any Contingent Coupons and capital loss (if any) upon the sale, redemption or maturity of your Notes may result in adverse tax consequences to you because an investor’s ability to deduct capital losses is subject to significant limitations.  You should consult your tax advisor as to the possible alternative treatments in respect of the Notes.

·Many Economic and Market Factors Will Impact the Value of the Notes—The value of the Notes will be affected by a number of economic and market factors that interact in complex and unpredictable ways and that may either offset or magnify each other, including:

othe market price of, dividend rate on and expected volatility of the Reference Asset and the components of its underlying index;

othe time to maturity of the Notes;

ointerest and yield rates in the market generally;

oa variety of economic, financial, political, regulatory or judicial events;

osupply and demand for the Notes; and

oour creditworthiness, including actual or anticipated downgrades in our credit ratings.

PPS-11

INFORMATION REGARDING THE REFRENCE ASSET

We have derived all information contained in this pricing supplement regarding the Reference Asset, including, without limitation, its make-up, method of calculation and changes in its components, from the Reference Asset’s prospectus, dated May 1, 2017 and other publicly available information. Such information reflects the policies of, and is subject to change by, Van Eck Associates Corporation (“Van Eck”), the adviser to the Reference Asset. The Reference Asset is an exchange-traded fund that seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the NYSE Arca Gold Miners Index. Shares of the Reference Asset trade on the NYSE Arca, Inc. under the ticker symbol “GDX”.

VanEck Vectors ETF Trust (the “Trust”) is a registered investment company that consists of numerous separate investment portfolios, including the Reference Asset. Information provided to or filed with the SEC by the Trust pursuant to the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, can be located by reference to SEC file number 333-123257 or CIK number 0001137360.  In addition, information about the Trust and the Reference Asset may be obtained from other sources, including, but not limited to, press releases, newspaper articles and other publicly disseminated documents and Van Eck’s website at www.vaneck.com.  We have not undertaken any independent review or due diligence of the SEC filings related to the Reference Asset, any information contained on Van Eck’s website, or of any other publicly available information about the Reference Asset. Information contained in outside sources is not incorporated by reference in, and should not be considered a part of, this pricing supplement.

Investment Objective and Strategy

The Reference Asset is an exchange-traded fund that seeks to replicate as closely as possible, before fees and expenses, the price and yield performance of the NYSE Arca Gold Miners Index, which includes the common stocks and American Depositary Receipts (“ADRs”) of companies involved in the gold mining industry. For more information about the NYSE Arca Gold Miners Index, see “The NYSE Arca Gold Miners Index” below.

The Reference Asset uses a “passive” or indexing investment approach where it attempts to approximate the investment performance of the NYSE Arca Gold Miners Index by investing in a portfolio of securities that generally replicates the NYSE Arca Gold Miners Index. The Reference Asset normally invests at least 80% of its total assets in securities that comprise the NYSE Arca Gold Miners Index. The Reference Asset may also utilize convertible securities and participation notes to seek performance that corresponds to the NYSE Arca Gold Miners Index.

Correlation

The NYSE Arca Gold Miners Index is a theoretical financial calculation while the Reference Asset is an actual investment portfolio. The performance of the Reference Asset and the NYSE Arca Gold Miners Index may vary due to due to operating expenses, transaction costs, cash flows, regulatory requirements and operational inefficiencies.

Industry Concentration Policy

The Reference Asset may concentrate its investments in a particular industry or group of industries to the extent that the NYSE Arca Gold Miners Index concentrates on an industry or group of industries.

The NYSE Arca Gold Miners Index

All disclosures contained in this pricing supplement regarding the NYSE Arca Gold Miners Index, including, without limitation, its make up, method of calculation, and changes in its components, have been derived from publicly available sources.  The information reflects the policies of, and is subject to change by, NYSE Arca, the sponsor of the NYSE Arca Gold Miners Index. NYSE Arca, which owns the copyright and all other rights to the NYSE Arca Gold Miners Index, has no obligation to continue to publish, and may discontinue publication of, the NYSE Arca Gold Miners Index.

The NYSE Arca Gold Miners Index is a modified market capitalization weighted index comprised of securities issued by publicly traded companies involved primarily in the mining of gold or silver.  The NYSE Arca Gold Miners Index was initially launched and published in October 2004.

Eligibility Criteria for Index Components

The NYSE Arca Gold Miners Index includes common stocks or ADRs of selected companies that are involved in mining for gold and silver and that are listed for trading on the New York Stock Exchange, the NYSE Amex Stock Exchange or quoted on the NASDAQ Global Market. Only companies with a market capitalization of greater than $100 million that have an average daily trading volume of at least 50,000 shares or ADRs over the past six months are eligible for inclusion in the NYSE Arca Gold Miners Index. NYSE Arca has the discretion to not include all companies that meet the minimum criteria for inclusion.

PPS-12

Calculation of the NYSE Arca Gold Miners Index

The NYSE Arca Gold Miners Index is calculated by NYSE Arca on a price return basis. The calculation is based on the current modified market capitalization divided by a divisor. The divisor was determined on the initial capitalization base of the NYSE Arca Gold Miners Index and the base level and may be adjusted as a result of corporate actions and composition changes, as described below. The level of the NYSE Arca Gold Miners Index was set at 500.00 on December 20, 2002, which is the index base date. The NYSE Arca Gold Miners Index is calculated using the following formula:

Where:

t = day of calculation;

N = number of constituent equities in the NYSE Arca Gold Miners Index;

Qi,t = number of shares of equity i on day t;

Mi,t = multiplier of equity i;

Ci,t = price of equity i on day t; and

DIV = current index divisor on day t.

Index Maintenance

The NYSE Arca Gold Miners Index is reviewed quarterly to ensure that at least 90% of the NYSE Arca Gold Miners Index weight is accounted for by Index components that continue to meet the initial eligibility requirements. NYSE Arca may at any time and from time to time change the number of securities comprising the group by adding or deleting one or more securities, or replacing one or more securities contained in the group with one or more substitute securities of its choice, if in NYSE Arca’s discretion such addition, deletion or substitution is necessary or appropriate to maintain the quality and/or character of the NYSE Arca Gold Miners Index. Components will be removed from the NYSE Arca Gold Miners Index during the quarterly review if the market capitalization falls below $50 million or the traded average daily shares for the previous six months is lower than 25,000 shares.

At the time of the quarterly rebalance, the component security weights (also referred to as the multiplier or share weight of each component security) will be modified to conform to the following asset diversification requirements:

(1)the weight of any single component security may not account for more than 20% of the total value of the NYSE Arca Gold Miners Index;

(2)the component securities are split into two subgroups—large and small, which are ranked by market capitalization weight in the NYSE Arca Gold Miners Index. Large securities are defined as having a starting Index weight greater than or equal to 5%. Small securities are defined as having a starting Index weight below 5%; and

(3)the aggregate weight of those component securities which individually represent more than 4.5% of the total value of the NYSE Arca Gold Miners Index may not account for more than 50% of the total Index value.

The weights of the components securities (taking into account expected component changes and share adjustments) are modified in accordance with the NYSE Arca Gold Miners Index’s diversification rules.

Diversification Rule 1: If any component stock exceeds 20% of the total value of the NYSE Arca Gold Miners Index, then all stocks greater than 20% of the NYSE Arca Gold Miners Index are reduced to represent 20% of the value of the NYSE Arca Gold Miners Index. The aggregate amount by which all component stocks are reduced is redistributed proportionately across the remaining stocks that represent less than 20% of the NYSE Arca Gold Miners Index value. After this redistribution, if any other stock then exceeds 20%, the stock is set to 20% of the NYSE Arca Gold Miners Index value and the redistribution is repeated.

Diversification Rule 2: The components are sorted into two groups, large are components with a starting index weight of 5% or greater and small are those that are under 5% (after any adjustments for Diversification Rule 1). Each group in aggregate will represent 50% of the final index weight. The weight of each of the large stocks will be scaled down proportionately (with a floor of 5%) so that the aggregate weight of the large components will be reduced to represent 50% of the NYSE Arca Gold Miners Index. If any large component stock falls below a weight equal to the product of 5% and the proportion by which the stocks were scaled down following this distribution, then the weight of the stock is set equal to 5% and the components with weights greater than 5% will be reduced proportionately. The weight of each of the small components will be scaled up proportionately from the redistribution of the large components. If any small component stock exceeds a weight equal to the product of 4.5% and the proportion by which the stocks were scaled down following this distribution, then the weight of the stock is set equal to 4.5%. The redistribution of weight to the remaining stocks is repeated until the entire amount has been redistributed.

Changes to the NYSE Arca Gold Miners Index composition and/or the component security weights in the NYSE Arca Gold Miners Index are determined and announced prior to taking effect, which typically occurs after the close of trading on the third Friday of each calendar quarter month in connection with the quarterly Index rebalance. The share weight of each component security in the NYSE

PPS-13

Arca Gold Miners Index portfolio remains fixed between quarterly reviews except in the event of certain types of corporate actions such as stock splits, reverse stock splits, stock dividends, or similar events. The share weights used in the NYSE Arca Gold Miners Index calculation are not typically adjusted for shares issued or repurchased between quarterly reviews. However, in the event of a merger between two components, the share weight of the surviving entity may be adjusted to account for any stock issued in the acquisition. NYSE Arca may substitute securities or change the number of securities included in the NYSE Arca Gold Miners Index, based on changing conditions in the industry or in the event of certain types of corporate actions, including mergers, acquisitions, spin-offs, and reorganizations. In the event of component or share weight changes to the NYSE Arca Gold Miners Index portfolio, the payment of dividends other than ordinary cash dividends, spin-offs, rights offerings, re-capitalization, or other corporate actions affecting a component security of the NYSE Arca Gold Miners Index, the NYSE Arca Gold Miners Index divisor may be adjusted to ensure that there are no changes to the NYSE Arca Gold Miners Index level as a result of nonmarket forces.

PPS-14

Historical Performance of the Reference Asset

The table below shows the high, low and final Closing Prices for each of the periods noted below. The graph below graph sets forth the historical performance of the Reference Asset based on daily Closing Prices from January 1, 2012 through July 26, 2017. We obtained the Closing Prices of the Reference Asset listed in the table below and shown in the graph below from Bloomberg, L.P. We have not independently verified the accuracy or completeness of the information obtained from Bloomberg, L.P.

Period/Quarter Ended	Quarterly High ($)	Quarterly Low ($)	Quarterly Close ($)
March 31, 2012	57.47	48.75	49.57
June 30, 2012	50.37	39.34	44.77
September 30, 2012	54.81	40.70	53.71
December 31, 2012	54.25	44.85	46.39
March 28, 2013	47.09	35.91	37.85
June 30, 2013	37.45	22.22	24.41
September 30, 2013	30.43	22.90	25.06
December 31, 2013	26.52	20.39	21.12
March 31, 2014	27.73	21.27	23.60
June 30, 2014	26.45	22.04	26.45
September 30, 2014	27.46	21.35	21.35
December 31, 2014	21.94	16.59	18.38
March 31, 2015	22.94	17.67	18.24
June 30, 2015	20.82	17.76	17.76
September 30, 2015	17.85	13.04	13.74
December 31, 2015	16.90	13.08	13.72
March 31, 2016	20.86	12.47	19.98
June 30, 2016	27.70	19.53	27.70
September 30, 2016	31.32	25.45	26.43
December 31, 2016	25.96	18.99	20.92
March 31, 2017	25.57	21.14	22.81
June 30, 2017	24.57	21.10	22.08
July 26, 2017*	22.84	21.21	22.84

*For the period beginning July 1, 2017 and ending July 26, 2017

Historical Performance of the VanEck VectorsTM Gold Miners ETF

PAST PERFORMANCE IS NOT INDICATIVE OF FUTURE RESULTS

PPS-15

MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS

The material tax consequences of your investment in the Notes are summarized below.  The discussion below supplements the discussion under “Material U.S. Federal Income Tax Consequences” in the accompanying prospectus supplement.  Except as noted under “Non-U.S. Holders” below, this section applies to you only if you are a U.S. holder (as defined in the accompanying prospectus supplement) and you hold your Notes as capital assets for tax purposes and does not apply to you if you are a member of a class of holders subject to special rules or are otherwise excluded from the discussion in the prospectus supplement (for example, if you did not purchase your Notes in the initial issuance of the Notes).  In addition, this discussion does not apply to you if you purchase your Notes for less than the principal amount of the Notes.

The U.S. federal income tax consequences of your investment in the Notes are uncertain and the Internal Revenue Service could assert that the Notes should be taxed in a manner that is different than described below.  Pursuant to the terms of the Notes, Barclays Bank PLC and you agree, in the absence of a change in law or an administrative or judicial ruling to the contrary, to characterize your Notes as a contingent income-bearing derivative contract with respect to the Reference Asset.

If your Notes are properly treated as a contingent income-bearing derivative contract, you will likely be taxed on any Contingent Coupons you receive on the Notes as ordinary income in accordance with your regular method of accounting for U.S. federal income tax purposes.  In addition, you should recognize gain or loss upon the sale, redemption or maturity of your Notes in an amount equal to the difference (if any) between the amount you receive at such time and your tax basis in the Notes.  Except as described below, such gain or loss should generally be long-term capital gain or loss if you have held your Notes for more than one year, and otherwise should generally be short-term capital gain or loss.  Short-term capital gains are generally subject to tax at the marginal tax rates applicable to ordinary income.  However, it is possible that you should recognize ordinary income upon the sale of your Notes to the extent a portion of the sale proceeds relates to accrued Contingent Coupons that you have not yet included in ordinary income.  Any character mismatch arising from your inclusion of ordinary income in respect of any Contingent Coupons and capital loss (if any) upon the sale, redemption or maturity of your Notes may result in adverse tax consequences to you because an investor’s ability to deduct capital losses is subject to significant limitations.

In the opinion of our special tax counsel, Sullivan & Cromwell LLP, it would be reasonable to treat your Notes in the manner described above.  This opinion assumes that the description of the terms of the Notes in this preliminary pricing supplement is materially correct.

NO STATUTORY, JUDICIAL OR ADMINISTRATIVE AUTHORITY DIRECTLY DISCUSSES HOW YOUR NOTES SHOULD BE TREATED FOR U.S. FEDERAL INCOME TAX PURPOSES.  AS A RESULT, THE U.S. FEDERAL INCOME TAX CONSEQUENCES OF YOUR INVESTMENT IN THE NOTES ARE UNCERTAIN.  ACCORDINGLY, WE URGE YOU TO CONSULT YOUR TAX ADVISOR AS TO THE TAX CONSEQUENCES OF INVESTING IN THE NOTES.

Alternative Treatments.  As discussed further in the accompanying prospectus supplement, the Treasury Department and the Internal Revenue Service are actively considering various alternative treatments that may apply to instruments such as the Notes, possibly with retroactive effect.  Other alternative treatments for your Notes may also be possible under current law.  For example, it is possible that the Notes could be treated as debt instruments subject to the special tax rules governing contingent payment debt instruments. Under the contingent payment debt instrument rules, you generally would be required to accrue interest on a current basis in respect of the Notes over their term based on the comparable yield and projected payment schedule for the Notes and pay tax accordingly, even though these amounts may exceed the Contingent Coupons (if any) that are paid on the Notes.  You would also be required to make adjustments to your accruals if the actual amounts that you receive in any taxable year differ from the amounts shown on the projected payment schedule.  In addition, any gain you may recognize on the sale, redemption or maturity of the Notes would be taxed as ordinary interest income and any loss you may recognize on the sale, redemption or maturity of the Notes would generally be ordinary loss to the extent of the interest you previously included as income without an offsetting negative adjustment and thereafter would be capital loss.  You should consult your tax advisor as to the special rules that govern contingent payment debt instruments.

It is also possible that your Notes could be treated as an investment unit consisting of (i) a debt instrument that is issued to you by us and (ii) a put option in respect of the Reference Asset that is issued by you to us.  You should consult your tax advisor as to the possible consequences of this alternative treatment.

For a further discussion of the tax treatment of your Notes and the Contingent Coupons to be paid on the Notes as well as other possible alternative characterizations, please see the discussion under the heading “Material U.S. Federal Income Tax Consequences—Notes Treated as Prepaid Forward or Derivative Contracts with Associated (Contingent) Coupons” in the accompanying prospectus supplement.  You should consult your tax advisor as to the possible alternative treatments in respect of the Notes.  For additional, important considerations related to tax risks associated with investing in the Notes, you should also examine the discussion in “Selected Risk Considerations—Taxes”, in this preliminary pricing supplement.

Non-U.S. Holders.  Barclays currently does not withhold on payments to non-U.S. holders in respect of instruments such as the Notes.  However, if Barclays determines that there is a material risk that it will be required to withhold on any such payments, Barclays may withhold on any Contingent Coupons at a 30% rate, unless you have provided to Barclays (i) a valid Internal Revenue Service Form W-8ECI or (ii) a valid Internal Revenue Service Form W-8BEN or Internal Revenue Service Form W-8BEN-E claiming tax treaty benefits that reduce or eliminate withholding.  If Barclays elects to withhold and you have provided Barclays with a valid Internal

PPS-16

Revenue Service Form W-8BEN or Internal Revenue Service Form W-8BEN-E claiming tax treaty benefits that reduce or eliminate withholding, Barclays may nevertheless withhold up to 30% on any Contingent Coupons it pays to you if there is any possible characterization of the payments that would not be exempt from withholding under the treaty.  Non-U.S. holders will also be subject to the general rules regarding information reporting and backup withholding as described under the heading “Material U.S. Federal Income Tax Consequences—Information Reporting and Backup Withholding” in the accompanying prospectus supplement.

The following replaces the discussion of Section 871(m) of the Internal Revenue Code in the accompanying prospectus supplement under “Material U.S. Federal Income Tax Consequences—Tax Consequences to Non-U.S. Holders—Section 871(m) Withholding.”  The Treasury Department has issued regulations under Section 871(m) of the Internal Revenue Code which impose U.S. federal withholding tax on “dividend equivalent” payments made on certain contracts linked to U.S. corporations that are owned by non-U.S. holders.  However, the regulations will only apply to a contract that is issued before January 1, 2018 if the contract is a “delta-one” contract (i.e., a contract that provides for “delta-one” exposure to underlying U.S. corporations).  We have determined that the Notes are not delta-one contracts for this purpose, and we therefore believe, and intend to take the position, that payments on the Notes should not be subject to Section 871(m) withholding tax.

However, a non-U.S. holder could nevertheless be subject to Section 871(m) tax in respect of the Notes if (a) the holder’s position under the Notes would be delta-one when combined with other related  positions that are held by the holder or (b) if a principal purpose for the holder’s investment in Notes is to avoid the application of Section 871(m), in which case a special Section 871(m) anti-abuse rule could apply to the holder’s investment in the Notes.  Non-U.S. holders are urged to consult their tax advisors regarding the application of Section 871(m) to the Notes and the possibility that the combination rule or anti-abuse rule could apply to their investment in the Notes.

SUPPLEMENTAL PLAN OF DISTRIBUTION

We will agree to sell to Barclays Capital Inc. (the “Agent”), and the Agent will agree to purchase from us, the principal amount of the Notes, and at the price, specified on the cover of the related pricing supplement, the document that will be filed pursuant to Rule 424(b) containing the final pricing terms of the Notes. The Agent will commit to take and pay for all of the Notes, if any are taken.

PPS-17