EXHIBIT 99.1

Unaudited Condensed Consolidated Interim Financial Statements of

NEXGEN ENERGY LTD.

September 30, 2017 and 2016

NEXGEN ENERGY LTD.

CONDENSED CONSOLIDATED INTERIM STATEMENTS OF FINANCIAL POSITION

(Expressed in Canadian Dollars)

(Unaudited)

As at

	Note		September 30, 2017			December 31, 2016
ASSETS
Current
Cash and cash equivalents			$	180,725,909		$	31,090,313
Short-term investments				-			47,455,100
Amounts receivable				836,483			807,447
Prepaid expenses				302,969			72,575
				181,865,361			79,425,435
Non-current
Deposits		6		32,927			22,852
Exploration and evaluation assets		5		142,339,673			109,446,920
Equipment		7		4,206,279			3,601,178
				146,578,879			113,070,950
TOTAL ASSETS			$	328,444,240		$	192,496,385
LIABILITIES
Current
Accounts payable and accrued liabilities			$	7,555,430		$	2,248,912
Flow-through share premium liability		6		147,719			179,212
				7,703,149			2,428,124
Non-current
Deferred income tax liability				251,128			136,588
Deferred lease inducement				83,533			113,606
Convertible debentures		8		147,931,103			70,811,801
				148,265,764			71,061,995
TOTAL LIABILITIES				155,968,913			73,490,119
EQUITY
Share capital		9		193,732,328			125,735,515
Reserves		9		22,563,531			17,005,665
Accumulated deficit				(55,981,539	)		(32,743,616	)
				160,314,320			109,997,564
Non-controlling interests				12,161,007			9,008,702
TOTAL EQUITY				172,475,327			119,006,266
TOTAL LIABILITIES AND EQUITY			$	328,444,240		$	192,496,385

Nature of operations (Note 2)

Commitments (Notes 5 and 6)

The accompanying notes are an integral part of the condensed consolidated interim financial statements

These condensed consolidated interim financial statements were authorized for issue by the Board of Directors on November 7, 2017

2

NEXGEN ENERGY LTD.

CONDENSED CONSOLIDATED INTERIM STATEMENTS OF LOSS (PROFIT) AND COMPREHENSIVE LOSS (PROFIT)

(Expressed in Canadian Dollars)

(Unaudited)

		For the three months ended						For the nine months ended
	Note	September 30, 2017			September 30, 2016			September 30, 2017			September 30, 2016
Salaries, benefits and directors' fees	10	$	1,454,473		$	496,018		$	2,936,332		$	1,927,492
Office and administrative			477,185			378,802			1,138,512			1,017,401
Professional fees			421,166			381,658			1,265,403			658,756
Travel			158,112			107,003			488,599			430,295
Depreciation	7		210,308			234,774			581,420			455,214
Share-based payments	9, 10		1,293,734			1,078,427			5,034,528			4,513,895
Finance income			(448,744	)		(51,883	)		(756,790	)		(194,530	)
Interest expense	8		2,515,136			1,466,715			5,504,501			1,788,890
Mark to market loss (gain) on convertible debentures	8		(7,800,655	)		(10,556,927	)		4,084,122			(10,622,812	)
Convertible debenture issuance costs	8		2,811,146			-			2,811,146			4,052,398
Foreign exchange loss (gain)			1,055,215			(859,001	)		1,567,441			(1,931,920	)
Loss (profit) from operations		$	2,147,076		$	(7,324,414	)	$	24,655,214		$	2,095,079
Deferred income tax expense (recovery)			(95,885	)		(72,199	)		(24,610	)		(72,199	)
Loss (profit) and comprehensive loss (profit) for the period		$	2,051,191		$	(7,396,613	)	$	24,630,604		$	2,022,880
Loss (profit) and comprehensive loss (profit) attributable to:
Shareholders of NexGen Energy Ltd.		$	1,828,692		$	(7,480,320	)	$	23,981,478		$	1,918,983
Non-controlling interests in IsoEnergy Ltd.			222,499			83,707			649,126			103,897
Loss (profit) and comprehensive loss (profit) for the period		$	2,051,191		$	(7,396,613	)	$	24,630,604		$	2,022,880
Loss (profit) per common share attributable to the Company's common shareholders - basic and diluted		$	0.01		$	(0.02	)	$	0.08		$	0.01
Weighted average number of common shares outstanding - basic and diluted			332,702,616			303,572,343			316,247,722			298,723,694

The accompanying notes are an integral part of the condensed consolidated interim financial statements

3

NEXGEN ENERGY LTD.

CONDENSED CONSOLIDATED INTERIM STATEMENTS OF CHANGES IN EQUITY

(Expressed in Canadian Dollars)

(Unaudited)

	Note		Number ofCommonShares		ShareCapital			Reserves			Accumulaed Deficit			Non-controlling Interests			Total
Balance as at December 31, 2015				286,884,616	$	110,024,398		$	7,530,180		$	(17,398,941	)	$	-		$	100,155,637
Exercise of warrants				14,787,443		10,300,543			(934,361	)		-			-			9,366,182
Exercise of options				1,175,000		769,353			(285,853	)		-			-			483,500
Share insurance costs				-		(12	)		-			-			-			(12	)
Issue of shares for exploration and evaluation assets				49,861		48,864			-			-			-			48,864
Issue of shares on convertible debenture financing				1,005,586		2,292,480			-			-			-			2,292,480
Share-based payments				-		-			6,350,931			-			-			6,350,931
Issue of shares of subsidiary to non-controlling interests				-		-			-			1,213,449			7,445,982			8,659,431
Loss for the period				-		-			-			(1,918,983	)		(103,897	)		(2,022,880	)
Balance as at September 30, 2016				303,902,506	$	123,435,626		$	12,660,897		$	(18,104,475	)	$	7,342,085		$	125,334,133
Balance as at December 31, 2016				306,190,287	$	125,735,515		$	17,005,665		$	(32,743,616	)	$	9,008,702		$	119,006,266
Exercise of warrants		9		5,714,286		2,857,143			-			-			-			2,857,143
Exercise of options		9		1,257,779		1,358,235			(603,535	)		-			-			754,700
Share issuance costs		5, 9		-		(2,519,632	)		-			-			-			(2,519,632	)
Issue of shares for cash from private placement		9		24,146,424		62,745,000			-			-			-			62,745,000
Issue of shares on convertible debenture financing		9		869,271		2,258,820			-			-			-			2,258,820
Issue of shares on convertible debenture interest payment		9		327,863		963,917			-			-			-			963,917
Issue of shares for exploration and evaluation assets		5		111,110		333,330			-			-			-			333,330
Share-based payments		9		-		-			6,757,365			-			-			6,757,365
Reserve re-allocation for expired warrants		9							(595,964	)		595,964						-
Issue of shares of subsidiary to non-controlling interests				-		-			-			147,591			3,801,431			3,949,022
Loss for the period				-		-			-			(23,981,478	)		(649,126	)		(24,630,604	)
Balance as at September 30, 2017				338,617,020	$	193,732,328		$	22,563,531		$	(55,981,539	)	$	12,161,007		$	172,475,327

The accompanying notes are an integral part of the condensed consolidated interim financial statements

4

NEXGEN ENERGY LTD.

CONDENSED CONSOLIDATED INTERIM STATEMENTS OF CASH FLOWS

(Expressed in Canadian Dollars)

(Unaudited)

For the nine months ended

	September 30, 2017			September 30, 2016
Cash flows (used in) from operating activities
Loss for the period	$	(24,630,604	)	$	(2,022,880	)
Items not involving cash:
Depreciation		581,420			455,214
Share-based payments		5,034,528			4,513,895
Amortization of deferred lease inducement		(30,072	)		(30,072	)
Unrealized foreign exchange loss (gain) on cash and cash equivalents		2,105,308			(597,078	)
Deferred income tax expense (recovery)		(24,610	)		(72,199	)
Mark to market loss (gain) on convertible debentures		4,084,122			(10,622,812	)
Interest expense		5,504,501			1,788,890
Changes in non-cash working capital items:
Amounts receivable		(29,036	)		(433,235	)
Prepaid expenses		(230,394	)		30,068
Accounts payable and accrued liabilities		(891,987	)		616,630
Liability to issue shares		-			25,750
Deposits		(10,075	)		(5,452	)
	$	(8,536,899	)	$	(6,353,281	)
Cash flows (used in) from investing activities
Acquisition of exploration and evaluation assets	$	(24,275,973	)	$	(31,078,677	)
Acquisition of equipment		(1,024,334	)		(2,502,631	)
Sale and maturity of short-term investments		47,455,100			-
Receipt of deferred lease inducement payment		-			193,799
	$	22,154,793		$	(33,387,509	)
Cash flows (used in) from financing activities
Cash from exercise of options and warrants, net of share issuance costs	$	3,611,843		$	9,849,670
Shares issued for cash from private placements, net of share issuance costs		60,225,368			-
Shares of subsidiary issued to non-controlling interests for cash, net of share issuance costs		1,017,249			7,841,251
Interest paid on convertible debentures		(2,025,450	)		-
Shares issued in connection with issuance of convertible debentures		2,258,820			2,292,480
Issuance of convertible debentures		73,035,180			74,123,520
	$	138,123,010		$	94,106,921
Change in cash and cash equivalents	$	151,740,904		$	54,366,131
Cash and cash equivalents, beginning of period		31,090,313			34,303,982
Effect of exchange rate fluctuations on cash held		(2,105,308	)		597,078
Cash and cash equivalents, end of period	$	180,725,909		$	89,267,191
Cash and cash equivalents consist of:
Cash	$	155,725,909		$	21,631,091
Cash equivalents		25,000,000			67,636,100
Cash and cash equivalents	$	180,725,909		$	89,267,191

Supplemental disclosure with respect to cash flows (Note 14)

The accompanying notes are an integral part of the condensed consolidated interim financial statements

5

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

1. REPORTING ENTITY

NexGen Energy Ltd. ("NexGen" or the "Company") is an exploration stage entity engaged in the acquisition, exploration and evaluation of uranium properties in Canada. The Company was incorporated pursuant to the provisions of the British Columbia Business Corporations Act on March 8, 2011. The Company's registered records office is located on the 25^th Floor, 700 West Georgia Street, Vancouver, B.C., V7Y 1B3.

On April 19, 2013, the Company (as it was then called, Clermont Capital Inc. ("Clermont")) completed its qualifying transaction, which was effected pursuant to an amalgamation agreement dated December 31, 2012 (the "Amalgamation Agreement") amongst Clermont, 0957633 B.C. Ltd., a wholly owned subsidiary of Clermont, and NexGen Energy Ltd. ("Old NexGen"). Pursuant to the Amalgamation Agreement, the shareholders of Old NexGen were issued one common share of Clermont (on a post-share consolidation basis) for every one Old NexGen common share held immediately prior to the completion of the amalgamation. In connection with the Qualifying Transaction, Clermont also completed a consolidation of its common shares on a 2.35:1 basis and changed its name to "NexGen Energy Ltd.".  The Company's acquisition of Old NexGen was accounted for as a reverse takeover.

The Company commenced trading on the TSX Venture Exchange ("TSX-V") as a Tier 2 Issuer under the symbol "NXE" on April 23, 2013.  On August 7, 2015, the Company became a Tier 1 Issuer. On July 15, 2016, NexGen graduated and commenced trading on the Toronto Stock Exchange ("TSX") under its existing symbol. The Company's common shares ceased trading on the OTCQX Best Market under the symbol "NXGEF" upon the commencement of trading on the NYSE American LLC ("NYSE American") under the symbol "NXE" on May 17, 2017.

In February 2016, the Company incorporated four wholly owned subsidiaries: NXE Energy Royalty Ltd., NXE Energy SW1 Ltd., NXE Energy SW3 Ltd., and IsoEnergy Ltd. (collectively, the "Subsidiaries"). The Subsidiaries were incorporated to hold certain exploration assets of the Company. In the three months ended June 30, 2016, certain exploration and evaluation assets were transferred to each of IsoEnergy Ltd. ("IsoEnergy"), NXE Energy SW1 Ltd. and NXE Energy SW3 Ltd. (Note 5). Subsequent to the transfer, IsoEnergy shares were issued to third parties pursuant to external financings and listed its common shares on the TSX-V, with NexGen retaining 63.9% of IsoEnergy's outstanding common shares as at September 30, 2017.

2. NATURE OF OPERATIONS

As an exploration stage company, the Company does not have revenues and historically has recurring operating losses.  As at September 30, 2017, the Company had an accumulated deficit of $55,981,539 and working capital of $174,309,931. During the three-month period ended September 30, 2017, the Company completed a debt and equity financing (Notes 8 and 9). The Company will be required to obtain additional funding in order to continue with the exploration and development of its mineral properties and to repay its convertible debentures (Note 8), if required.

The business of exploring for minerals involves a high degree of risk. NexGen is an exploration company and is subject to risks and challenges similar to companies in a comparable stage. These risks include, but are not limited to, the challenges of securing adequate capital; development and operational risks inherent in the mining industry; changes in government policies and regulations; the ability to obtain the necessary environmental permits or, alternatively NexGen's ability to dispose of its exploration and evaluation assets on an advantageous basis; as well as global economic and uranium price volatility; all of which are uncertain.

The underlying value of the exploration and evaluation assets is dependent upon the existence and economic recovery of mineral reserves and is subject to, but not limited to, the risks and challenges identified above. Changes in future conditions could require material write-downs of the carrying value of exploration and evaluation assets.

3. BASIS OF PRESENTATION

Statement of Compliance

These condensed consolidated interim financial statements for the three and nine months ended September 30, 2017, including comparatives, have been prepared in accordance with International Accounting Standard ("IAS") 34, Interim Financial Reporting. They do not include all of the information required by International Financial Reporting Standards ("IFRS") for annual financial statements, and should be read in conjunction with the Company's consolidated financial statements as at and for the year ended December 31, 2016.  Accordingly, accounting policies applied other than as discussed in Note 4 are the same as those applied in the Company's annual financial statements.  These condensed consolidated interim financial statements were authorized for issue by the Board of Directors on November 7, 2017.

6

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

3. BASIS OF PRESENTATION (continued)

Basis of Presentation

These condensed consolidated interim financial statements have been prepared on a historical cost basis, except for certain financial instruments which have been measured at fair value, including the convertible debentures issued by the Company (Note 8). In addition, these condensed consolidated interim financial statements have been prepared using the accrual basis of accounting, except for cash flow information. All monetary references expressed in these notes are references to Canadian dollar amounts ("$"). These financial statements are presented in Canadian dollars, which is the functional currency of the Company and its subsidiaries.

Critical accounting judgments, estimates and assumptions

The preparation of the condensed consolidated interim financial statements requires management to make judgments, estimates and assumptions that affect the reported amounts of assets, liabilities and contingent liabilities at the date of the condensed consolidated interim financial statements and the reported amounts of revenues and expenses during the reporting period. Estimates and assumptions are continuously evaluated and are based on management's experience and other factors, including expectations of future events that are believed to be reasonable in the circumstances. Uncertainty about these judgments, estimates and assumptions could result in a material adjustment to the carrying amount of the asset or liability affected in future periods.

Where the fair value of financial assets and financial liabilities recorded in the financial statements cannot be derived from active markets, their fair value is determined using valuation models. The inputs to these models are taken from observable markets where possible, but where this is not feasible, a degree of judgment is required in establishing fair values. The judgments include considerations of inputs such as liquidity risk, credit risk and volatility. Changes in assumptions about these factors could affect the reported fair value of financial instruments.

4. SIGNIFICANT ACCOUNTING POLICIES

The accounting policies followed by the Company are set out in Note 4 to the audited financial statements for the year ended December 31, 2016, and have been consistently followed in the preparation of these condensed consolidated interim financial statements except for the following change in accounting policy:

Change in accounting policy:

In the prior year, the proceeds allocated to the flow-through share premium was recognized as "income on reduction of flow-through premium liability" in the consolidated statement of loss (profit) and comprehensive loss (profit) over the period that the flow-through proceeds were spent on eligible exploration expenditures. Commencing January 1, 2017, this premium is measured on the same basis, however, it is recorded as a deferred tax benefit. The Company voluntarily changed this classification with a view to better present the results of the Company. The impact on the statement of loss (profit) and comprehensive loss (profit) and statement of cash flows for the three-month and nine-month periods ended September 30, 2016 is a $72,199 reclassification from income on reduction of flow-through premium liability to deferred income tax recovery.

Future accounting pronouncements:

The following standards have not been adopted by the Company and are being evaluated to determine their impact:

· IFRS 9: New standard that replaced IAS 39 for classification and measurement of financial instruments, effective for annual periods beginning on or after January 1, 2018. The extent of the impact of adoption of the standard has not yet been determined.

· IFRS 16: New standard that will replace IAS 17 for the accounting and measurement of leases with a term of more than 12 months, effective for annual periods beginning on or after January 1, 2019. The Company does not expect the standard to have a material impact on its financial statements.

· IFRS 2: This standard was amended to clarify how to account for certain types of share-based payment transactions, effective for annual periods beginning on or after January 1, 2018. The amendments provide for the accounting of vesting and non-vesting conditions on the measurement of cash-settled share-based payments, share-based payment transactions with a net settlement feature for withholding tax obligations, and a modification to the terms and conditions of a share-based payment that changes the classification of the transaction from cash-settled to equity-settled. The extent of the impact of adoption of the amended standard has not yet been determined.

7

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

5. EXPLORATION AND EVALUATION ASSETS

(a) Rook 1 Property

The Rook I Project is located in Northern Saskatchewan, approximately 40 kilometres (km) east of the Saskatchewan – Alberta border, approximately 150 km north of the town of La Loche and 640 km northwest of the City of Saskatoon. The Rook I Project consists of 32 contiguous mineral claims totalling 35,065 hectares.

NexGen has a 100% interest in the claims subject only to: (i) a 2% net smelter return royalty ("NSR"); and (ii) a 10% production carried interest, in each case, only on claims S-113928 to S-113933. The NSR may be reduced to 1% upon payment of $1 million. The 10% production carried interest provides for the owner to be carried to the date of commercial production.

(b) Other Athabasca Basin Properties

Other Athabasca Basin properties comprises various mineral claims throughout the region.

On May 1, 2014, the Company issued 361,930 common shares valued at $119,436 to Long Harbour Exploration Corp. (now NxGold Ltd. ("NxGold")) to acquire a 75% interest in, and an option to acquire the remaining 25% interest in, five mineral claims comprising the Madison Lake and 2Z Lake properties.  The Company also paid $15,000 in finder's fees.

On October 15, 2015, two corporate officers of the Company were appointed to the Board of Directors of NxGold.

On February 26, 2016, the Company issued 49,861 common shares recorded at the quoted market price of $48,864 at the time of issuance to NxGold on the exercise of its option to acquire the remaining 25% interest in mineral claims comprising the Madison Lake and 2Z Lake properties. The Company also paid $5,000 in finder's fees. These mineral claims are subject to a royalty of 2% of net smelter returns and a 2% gross overriding royalty on production from the property.

On June 17, 2016, NexGen entered into an agreement with its subsidiaries, NXE Energy SW1 Ltd.  ("SW1") and NXE Energy SW3 Ltd. ("SW3"), to transfer certain of its exploration assets to SW1 and SW3. These assets include the following mineral properties: Castle South Extension, Maybelle River, Gartner and King to SW1 and Sandhill, Dufferin, Rook II and Virgin Trend to SW3 (collectively, the "Transferred Properties"). The Company received 800,469 common shares of SW1 and 2,995,787 common shares of SW3 in exchange for the Transferred Properties. 

During the year ended December 31, 2016, the Company recognized an impairment of $964,858 associated with certain Sandhill Lake, Castle South and Castle North properties in the statement of loss and comprehensive loss. The Company decided not to continue exploring some of the claims and allowed them to lapse.

On September 18, 2017, the Company issued 111,110 common shares recorded at a quoted market price of $333,330 to acquire the remaining 40% interest in the Dufferin Lake property.  Share issuance costs of $6,604 were incurred.

(c) IsoEnergy Properties

The Radio property is located in Northern Saskatchewan.  In December 2011, Tigers Realm Minerals Pty Ltd ("Tigers Realm"), a shareholder of NexGen, entered into the Radio Option Agreement with three arm's length individuals (collectively, the "Optionors") pursuant to which Tigers Realm was granted the exclusive right and option to earn an undivided 70% interest in the Radio property in exchange for a combination of cash, shares and an obligation to incur certain exploration expenditures. On February 21, 2012, Tigers Realm assigned all of its interest in the Radio Option Agreement to NexGen.

The Radio Option Agreement was subsequently amended by agreements dated June 5, 2012, November 23, 2012, April 12, 2013, June 25, 2013, and June 28, 2013.  As of December 31, 2013, NexGen had satisfied all of its obligations under the Radio Option Agreement except an obligation to incur $15,000,000 of expenditures over a two-year period ending March 31, 2015.

By agreement dated February 21, 2014, the Radio Option Agreement was further amended to delete the expenditure requirement described above and instead require that NexGen incur expenditures of $10,000,000 between January 1, 2014 and May 31, 2017, in exchange for 5,714,286 units (issued) priced at $0.35 per unit, each unit comprising one common share and one common share purchase warrant of the Company, where each warrant was exercisable at a price of $0.50 into one common share of the Company until May 31, 2017 (Note 9(b)).

On June 17, 2016, NexGen entered into an agreement with its subsidiary, IsoEnergy, to transfer certain of its exploration assets to IsoEnergy. These assets include the following mineral properties: Radio property, Thorburn Lake property, 2Z Lake property, Madison Lake property and the Carlson Creek property (collectively, the "Transferred Property Interests"). The Company received 29,000,000 common shares of IsoEnergy in exchange for the Transferred Property Interests. 

In June 2016, IsoEnergy issued 1,000,000 of its common shares and $100,000 in cash in exchange for a 100% interest in the Thorburn North property, mineral claim S-111628.

8

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

5. EXPLORATION AND EVALUATION ASSETS (continued)

(c) IsoEnergy Properties, continued

In May 2017, IsoEnergy paid the Optionors $105,000 related to contract commitments and $15,050 in legal fees related to the original Radio property acquisition.

The Radio Option Agreement was further amended by three successive agreements between IsoEnergy and the Optionors dated May 26, 2017, June 30, 2017 and July 5, 2017 extending the $10,000,000 expenditure requirement between January 1, 2014 to each of the agreement dates.

On July 5, 2017, IsoEnergy acquired 100% of the Radio Property in exchange for 3,000,000 common shares of IsoEnergy valued at $2,340,000, thereby terminating the Radio Option Agreement and its related $10,000,000 expenditure requirement, with the exception that the Optionors shall retain a 2% net smelter royalty and a 2% gross overriding royalty on production from the property, calculated in accordance with the original terms in the Radio Option Agreement.  The gross overriding royalty applies only to gems and gemstones.

On August 8, 2017, IsoEnergy acquired a 100% interest in three mineral claims constituting the 4,188 hectare Geiger Property in the Eastern Athabasca Basin of Saskatchewan in exchange for 1,000,000 common shares of IsoEnergy valued at $700,000 and a cash payment of $100,000.

The following is a summary of the capitalized costs on the projects described above.

	Rook 1	Other Athabasca Basin Properties	IsoEnergy Properties	Total
	$	$	$	$
Acquisition costs:
Balance, December 31, 2016	230,807	1,124,277	21,438,306	22,793,390
Additions	4,270	333,330	3,287,988	3,625,588
Balance, September 30, 2017	235,077	1,457,607	24,726,294	26,418,978
Deferred exploration costs:
Balance, December 31, 2016	77,007,303	4,318,909	5,327,318	86,653,530
Additions:
Drilling	17,096,734	3,300	1,150,051	18,250,085
General exploration	1,577,366	23,700	107,557	1,708,623
Geological and geophysical	3,206,488	89,146	300,890	3,596,524
Labour and wages	3,075,142	-	340,261	3,415,403
Share-based payments (Note 9)	1,419,855	-	302,982	1,722,837
Travel	500,753	-	72,940	573,693
	26,876,338	116,146	2,274,681	29,267,165
Balance, September 30, 2017	103,883,641	4,435,055	7,601,999	115,920,695
Total costs, Sepember 30, 2017	104,118,718	5,892,662	32,328,293	142,339,673

9

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

5. EXPLORATION AND EVALUATION ASSETS (continued)

	Rook 1	Other Athabasca Basin Properties	IsoEnergy Properties	Radio	Total
	$	$	$		$
Acquisition costs:
Balance, December 31, 2015	220,713	1,274,966	-	20,133,753	21,629,432
Additions	10,094	53,864	1,100,000	-	1,163,958
Properties transferred to IsoEnergy	-	(204,553)	20,338,306	(20,133,753)	-
Balance, December 31, 2016	230,807	1,124,277	21,438,306	-	22,793,390
Deferred exploration costs:
Balance, December 31, 2015	37,803,918	3,409,339	-	2,293,824	43,507,081
Additions:
Drilling	24,989,860	16,061	1,197,163	-	26,203,084
General exploration	2,283,418	8,873	119,460	-	2,411,751
Geological and geophysical	5,333,676	1,991,174	882,866	-	8,207,716
Labour and wages	3,542,893	-	363,420	-	3,906,313
Share-based payments (Note 9)	2,779,787	-	256,420	-	3,036,207
Travel	273,751	-	72,485	-	346,236
	39,203,385	2,016,108	2,891,814	-	44,111,307
Properties transffered to IsoEnergy	-	(141,680)	2,435,504	(2,293,824)	-
Impairment	-	(964,858)	-	-	(964,858)
Balance, December 31, 2016	77,007,303	4,318,909	5,327,318	-	86,653,530
Total costs, December 31, 2016	77,238,110	5,443,186	26,765,624	-	109,446,920

6. COMMITMENTS

Flow-through expenditures:

The Company periodically issues flow-through shares with any resulting flow-through premium recorded as a flow-through share premium liability. The liability is subsequently reduced when the required exploration expenditures are made, and accordingly, a recovery of flow-through premium is then recorded as a reduction of the deferred tax expense.

The Company's subsidiary, IsoEnergy, raised $4,328,100 and $1,100,000 through the issuance of flow-through shares during the year ended December 31, 2016 and the nine-month period ended September 30, 2017, respectively, and is required to spend such amounts on eligible exploration expenditures by December 31, 2017 and December 31, 2018, respectively.

As of September 30, 2017, IsoEnergy must fulfill $197,774 of the required exploration expenditures before December 31, 2017 and a further $1,100,000 by December 31, 2018.

A continuity of the flow-through share premium liability is as follows:

	Nine months ended			Year ended
	September 30, 2017			December 31, 2016
Balance, beginning of the period	$	179,212		$	-
Liability incurred on flow-through shares issued		130,000			393,464
Settlement of flow-through share liability on expenditure made		(161,493	)		(214,252	)
Balance, end of the period	$	147,719		$	179,212

10

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

6. COMMITMENTS (continued)

Office leases:

The Company and its subsidiary, IsoEnergy, have total office lease commitments at their Vancouver and Saskatoon offices as follows:

2017	$    93,712
2018	$  360,975
2019	$  325,294
2020	$  199,466

In connection with the Vancouver and Saskatoon office leases, the Company paid deposits of $17,400 and $10,075, respectively, with the landlords which will be applied to the final month's and final two months' rents, respectively, when the office lease terms expire.  IsoEnergy paid a deposit of $5,452 with its landlord which will be applied to the final month's rent when the office lease term expires.

7. EQUIPMENT

	Computing Equipment		Software		Field Equipment		Leasehold Improvemens		Road		Total
Cost
Balance a December 31, 2015	$	65,490	$	95,926	$	1,237,013	$	183,034	$	-	$	1,581,463
Additions		44,158		184,044		1,519,627		32,138		1,282,890		3,062,857
Balance at December 31, 2016		109,648		279,970		2,756,640		215,172		1,282,890		4,644,320
Additions		103,202		77,587		657,167		-		376,836		1,214,792
Balance at September 30, 2017	$	212,850	$	357,557	$	3,413,807	$	215,172	$	1,659,726	$	5,859,112
Accumulated Depreciation
Balance at December 31, 2015	$	42,259	$	40,458	$	305,114	$	6,101	$	-	$	393,932
Depreciation		24,920		81,119		338,343		41,743		163,085		649,210
Balance at December 31, 2016		67,179		121,577		643,457		47,844		163,085		1,043,142
Depreciation		38,714		81,339		366,299		32,370		90,969		609,691
Balance at September 30, 2017	$	105,893	$	202,916	$	1,009,756	$	80,214	$	254,054	$	1,652,833
Net book value
At December 31, 2016	$	42,469	$	158,393	$	2,113,183	$	167,328	$	1,119,805	$	3,601,178
At September 30, 2017	$	106,957	$	154,641	$	2,404,051	$	134,958	$	1,405,672	$	4,206,279

8. CONVERTIBLE DEBENTURES

	September 30, 2017		December 31, 2016
2016 Debentures (a)	$	79,048,476	$	70,811,801
2017 Debentures (b)		68,882,627		-
Convertible Debentures	$	147,931,103	$	70,811,801

(a) 2016 Debentures

On June 10, 2016, the Company issued US$60 million principal amount of convertible debentures (the "2016 Debentures") which were determined to be a hybrid financial instrument comprised of the host debt contract and multiple embedded derivatives. The Company received gross proceeds of $76,416,000 (US$60 million) and net proceeds of $72,363,602 (US$56,852,383) after deducting $4,052,398 (US$3,147,617) in transaction costs from the issue of the 2016 Debentures. A 3% establishment fee of $2,292,480 (US$1.8 million) was also paid to the debenture holders through the issuance of 1,005,586 common shares. The fair value of the 2016 Debentures on issuance date was determined to be $74,123,520 (US$58.2 million).

11

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

8. CONVERTIBLE DEBENTURES (continued)

(a) 2016 Debentures, continued

Pursuant to an amended and restated trust indenture dated July 21, 2017, the maturity date of the 2016 Debentures was extended to July 22, 2022.

The fair value of the 2016 Debentures increased from $70,811,801 (US$52,738,364) on December 31, 2016 to $79,048,476 (US$63,340,125) at September 30, 2017, resulting in a loss of $8,236,675 (US$6,306,822) for the nine-month period ended September 30, 2017. This loss, combined with the gain on the 2017 Debentures (see Note 8(b)) for the period ended September 30, 2017 was recorded in the statement of loss (profit) and comprehensive loss (profit).

	September 30, 2017			December 31, 2016
Fair value of 2016 Debentures, beginning of period	$	70,811,801		$	74,123,520
Fair value adjustment to September 30, 2017		8,236,675			(3,311,719	)
Interest payable		1,752,049			369,243
2016 Debentures and interest payable		80,800,525		$	71,181,044
Less: interest payable included in accounts payable & accrued liabilities		(1,752,049	)		(369,243	)
2016 Debentures	$	79,048,476		$	70,811,801

The 2016 Debentures were valued using a convertible bond pricing model based on a system of two coupled Black-Scholes equations where the debt and equity components are separately valued based on different default risks and assumptions.

The inputs used in the 2016 Debentures pricing model as at September 30, 2017 and December 31, 2016 are as follows:

	September 30, 2017	December 31, 2016
Historical stock price volatility	37.89%	40.00%
Expected life in years	4.81 years	4.44 years
Risk free interest rate	1.77%	1.91%
Expected dividend yield	0%	0%
Credit spread	26.44%	26.44%
Underlying share price of the Company	$2.77	$2.33
Conversion exercise price	US$2.3261	US$2.3261
Exchange rate (C$:US$)	$0.8013	$0.7448

(b) 2017 Debentures

On July 21, 2017, the Company issued US$60 million principal amount of convertible debentures (the "2017 Debentures") which were also determined to be a hybrid financial instrument comprised of the host debt contract and multiple embedded derivatives. The Company received gross proceeds of $75,294,000 (US$60 million) and net proceeds of $72,482,854 (US$57,759,864) after deducting $2,811,146 (US$2,240,136) in transaction costs from the issue of the 2017 Debentures. A 3% establishment fee of $2,258,820 (US$1.8 million) was also paid to the debenture holders through the issuance of 869,271 common shares. The fair value of the 2017 Debentures on issuance date was determined to be $73,035,180 (US$58,200,000).

The fair value of the 2017 Debentures decreased from $73,035,180 (US$58,200,000) on the initial measurement date to $68,882,627 (US$55,194,413) at September 30, 2017, resulting in a gain of $4,152,553 (US$3,333,670) for the period ended September 30, 2017. This gain, combined with the loss on the 2016 Debentures, for the nine-month period ended September 30, 2017 was recorded in loss (profit) and comprehensive loss (profit) for a total mark to market loss on convertible debentures of $4,084,122 (US$2,973,152).

	September 30, 2017
Fair value of 2017 Debentures on issuance	$	73,035,180
Fair value adjustment to September 30, 2017		(4,152,553	)
Interest payable		1,107,600
2017 Debentures and interest payable		69,990,227
Less: interest payable included in accounts payable & accrued liabilities		(1,107,600	)
2017 Debentures	$	68,882,627

The 2017 Debentures were valued using a convertible bond pricing model based on a system of two coupled Black-Scholes equations where the debt and equity components are separately valued based on different default risks and assumptions.

12

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

8. CONVERTIBLE DEBENTURES (continued)

(a)2017 Debentures, continued

The inputs used in the 2017 Debentures pricing model as at September 30, 2017 and July 21, 2017 are as follows:

	September 30, 2017	July 21, 2017
Historical stock price volatility	37.89%	38.46%
Expected life in years	4.81 years	5.00 years
Risk free interest rate	1.77%	1.66%
Expected dividend yield	0%	0%
Credit spread	26.44%	26.44%
Underlying share price of the Company	$2.77	$3.04
Conversion exercise price	US$2.6919	US$2.6919
Exchange rate (C$:US$)	$0.8013	$0.7969

General Terms

At inception, for each of the 2016 Debentures and 2017 Debentures (collectively, the "Convertible Debentures"), the Company made an irrevocable election to designate the Convertible Debentures as a financial liability at fair value through profit or loss. At their respective initial recognition date, the entire convertible instrument was measured at fair value with associated transaction costs expensed as incurred. Subsequent to initial recognition, the convertible financial instrument is marked to market at each financial reporting date and any change in fair value is recognized in profit or loss.

The Convertible Debentures bear interest at a rate of 7.5% per annum, payable semi-annually in US dollars on June 10 and December 10 in each year, with the first interest payment on the 2017 Debentures due on December 10, 2017. Two thirds of the interest (equal to 5% per annum) is payable in cash and one third of the interest (equal to 2.5% per annum) is payable, subject to any required regulatory approval, in common shares of the Company, using the volume-weighted average trading price ("VWAP") of the common shares on the exchange or market that has the greatest trading volume in the Company's common shares for the 20 consecutive trading days ending three trading days preceding the date on which such interest payment is due. For this purpose, the VWAP shall be converted into US dollars on each of the 20 days in the period, using the indicative rate of exchange for such currency as reported by the Bank of Canada.

The 2016 Debentures and 2017 Debentures are convertible, from time to time, into common shares of the Company at the option of the debenture holders at any time prior to maturity at a price per common share of US$2.3261 and US$2.6919, respectively (the "Conversion Price").

The 2016 Debentures and 2017 Debentures are not redeemable by the Company prior to June 10, 2019 and July 21, 2020, respectively. On or after June 10, 2019 and July 21, 2020 and prior to July 22, 2022, the 2016 Debentures and 2017 Debentures, respectively, may be redeemed by the Company, in whole or in part, at any time that the 20-day VWAP of the common shares exceeds 130% of the Conversion Price, on not less than 30 days' prior notice to the debenture holders. For this purpose, the VWAP shall be converted into US dollars on each of the 20 days in the period, using the indicative rate of exchange for such currency as reported by the Bank of Canada.

Upon completion of a change of control (which includes in the case of the holders' right to redeem the Convertible Debentures, a change in the Chief Executive Officer of the Company), the holders of the Convertible Debentures or the Company may require the Company to purchase or the holders to redeem, as the case may be, any outstanding Convertible Debentures in cash at: (i) on or prior to June 10, 2019 and July 21, 2020 for the 2016 Debentures and 2017 Debentures, respectively, 130% of the principal amount; and (ii) at any time thereafter, 115% of the principal amount, in each case plus accrued but unpaid interest, if any.  In addition, upon the public announcement of a change of control that is supported by the Board, the Company may require the holders of the Convertible Debentures to convert the Convertible Debentures into common shares at the Conversion Price provided the consideration payable upon the change of control exceeds the Conversion Price and is payable in cash.

13

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

8. CONVERTIBLE DEBENTURES (continued)

General Terms, continued

A "change of control" of the Company isdefined as consisting of: (a) the acquisition by a person or group of persons acting jointly or in concert of voting control or direction over 50% or more of the Company's outstanding common shares; (b) the amalgamation, consolidation or merger of the Company with or into another entity as a result of which the holders of the common shares immediately prior to such transaction, directly or indirectly, hold less than 50% of voting control or direction over the entity carrying on the business of the Company following such transaction; (c) the sale, assignment, transfer or other disposition of all or substantially all of the property or assets of the Company to another entity in which the holders of the common shares immediately prior to such transaction, directly or indirectly, hold less than 50% of voting control or direction over the other entity following such transaction; or (d) the removal by resolution of the shareholders of the Company, of more than 51% of the then incumbent directors of the Company which removal has not been recommended in the Company's management information circular, or the failure to elect to the Company's board of directors a majority of the directors proposed for election by management in the Company's management information circular.

9. SHARE CAPITAL AND RESERVES

Authorized Capital ‑ Unlimited number of common shares with no par value and unlimited number of preferred shares.

Issued

For the period ended September 30, 2017:

(a) During the nine months ended September 30, 2017, the Company issued a total of 1,257,779 common shares on the exercise of 199,446 options at a price of $0.24, 100,000 options at a price of $0.40, 50,000 options at a price of $0.425, 200,000 options at a price of $0.46, 300,000 options at a price of $0.50, 83,333 options at a price of $0.62, 250,000 options at a price of $0.64, 16,667 options at a price of $2.24, and 58,333 options at a price of $2.65 for total proceeds of $754,700. As a result of the exercises, $603,535 was reclassified from reserves to share capital.

(b) In May 2017, the Company issued a total of 5,714,286 common shares on the exercise of 5,714,286 warrants at a price of $0.50 for total proceeds of $2,857,143.

(c) On June 12, 2017, the Company issued a total of 327,863 common shares valued at $963,917 to the holders of the 2016 Debentures for the share portion of the debenture interest payment.

(d) On July 21, 2017, the Company completed a private placement pursuant to which it issued a total of 24,146,424 common shares at a price of US$2.0707 for gross proceeds of $62,745,000 (US$50 million). The Company also issued 869,271 common shares valued at $2,258,820 to the debenture holders as part of the establishment fee equal to 3% of the principal amount of the 2017 Debentures. Total share issuance costs for this financing was $2,513,028.

(e) On September 18, 2017, the Company issued 111,110 common shares valued at $333,330 to acquire the remaining 40% interest in the Dufferin Lake property included in the Other Athabasca Basin Properties (Note 5(b)). Total share issuance costs for this transaction was $6,604.

For the period ended September 30, 2016:

(a) On January 12, 2016, the Company issued 921,204 common shares and 460,602 common share purchase warrants on the exercise of 921,204 broker warrants at a price of $0.45 for total proceeds of $414,542. On February 11, 2016, the Company issued 460,602 common shares on the exercise of 460,602 common share purchase warrants at a price of $0.65 for additional proceeds of $299,391. As a result of the exercise, $221,089 was reclassified from reserves to share capital.

(b) On February 10, 2016 and February 12, 2016, the Company issued a total of 153,534 common shares on the exercise of 153,534 common share purchase warrants at a price of $0.65 for total proceeds of $99,796.

(c) On February 26, 2016, the Company issued 49,861 common shares valued at $48,864 for the acquisition of exploration and evaluation assets included in the Other Athabasca Basin Properties (Note 5b).

(d) During the three months ended March 31, 2016, the Company issued a total of 460,603 common shares on the exercise of 307,069 broker warrants and 153,534 common share purchase warrants at an exercise price of $0.45 and $0.65, respectively, for total proceeds of $237,978. As a result of the exercise, $73,697 was reclassified from reserves to share capital.

14

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

9. SHARE CAPITAL AND RESERVES (continued)

Issued, continued

(e) During the three months ended March 31, 2016, the Company issued 12,791,500 common shares on the exercise of 12,791,500 warrants at a price of $0.65 for total proceeds of $8,314,475. As a result of the exercise, $639,575 was re-allocated from reserves to share capital. The Company also issued 190,000 common shares on the exercise of 140,000 options at a price of $0.425 and 50,000 at a price of $0.46 for total proceeds of $82,500. As a result of the exercise, $40,940 was reclassified from reserves to share capital.

(f) On June 10, 2016, the Company issued 1,005,586 common shares valued at $2,292,480 to the debenture holders as part of the establishment fee equal to 3% of the principal amount of the 2016 Debentures.

(g) During the three months ended June 30, 2016, the Company issued a total of 110,000 common shares on the exercise of 60,000 options at a price of $0.425 and 50,000 options at a price of $0.40 for total proceeds of $45,500. As a result of the exercise, $21,306 was reclassified from reserves to share capital.

(h) During the three months ended September 30, 2016, the Company issued a total of 875,000 common shares on the exercise of 800,000 options at a price of $0.40, 50,000 options at a price of $0.46 and 25,000 options at a price of $0.50 for total proceeds of $355,500. As a result of the exercise, $223,607 was reclassified from reserves to share capital.

Warrants

Warrant transactions and the number of warrants outstanding are summarized as follows:

	Number of Warrants			Weighted Average Exercise Price
Outstanding at December 31, 2015		19,918,592		$	0.59
Exercised		(14,787,442	)		0.63
Issued on exercise of broker warrants		614,136			0.65
Expired		(31,000	)		0.65
Outstanding at December 31, 2016		5,714,286			0.50
Exercised		(5,714,286	)		0.50
Outstanding at September 30, 2017		-		$	-

Stock Options

Pursuant to the Company's stock option plan, directors may, from time to time, authorize the issuance of options to directors, officers, employees and consultants of the Company, enabling them to acquire up to 20% of the issued and outstanding common shares of the Company.

The options can be granted for a maximum term of 10 years and are subject to vesting provisions as determined by the Board of Directors of the Company.

Stock option transactions and the number of stock options are summarized as follows:

	Number of Stock Options			Weighted Average Exercise Price
Outstanding at December 31, 2015		27,124,446		$	0.48
Granted		10,200,000			2.45
Exercised		(2,941,666	)		0.41
Expired		(116,667	)		2.65
Forfeited		(800,001	)		1.36
Outstanding at December 31, 2016		33,466,112		$	1.06
Granted		400,000			3.18
Exercised		(1,257,779	)		0.60
Forfeited		(133,333	)		2.55
Outstanding at September 30, 2017		32,475,000		$	1.09
Number of options exercisable		26,141,667		$	0.88

15

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

9. SHARE CAPITAL AND RESERVES (continued)

Stock options, continued

As at September 30, 2017, the Company has stock options outstanding and exercisable as follows:

Number of Options	Number Exercisable	Exercise Price	Remaining Contractual Life (Years)	Expiry Date
3,600,000	3,600,000	$      0.400	0.34	January 31, 2018
1,450,000	1,450,000	$      0.400	0.83	July 30, 2018
250,000	250,000	$      0.300	1.22	December 19, 2018
2,625,000	2,625,000	$      0.400	1.64	May 23, 2019
750,000	750,000	$      0.400	1.67	June 2, 2019
4,550,000	4,550,000	$      0.460	2.23	December 24, 2019
4,200,000	4,200,000	$      0.500	2.66	May 27, 2020
500,000	500,000	$      0.620	2.98	September 22, 2020
4,575,000	3,050,000	$      0.640	3.21	December 16, 2020
250,000	166,667	$      2.690	3.69	June 8, 2021
5,275,000	3,516,666	$      2.650	3.73	June 23, 2021
500,000	166,667	$      1.510	4.11	November 8, 2021
3,550,000	1,183,333	$      2.240	4.21	December 15, 2021
150,000	50,000	$      3.300	4.31	January 19, 2022
250,000	83,334	$      3.110	4.56	April 22, 2022
32,475,000	26,141,667

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock options granted. The model requires management to make estimates, which are subjective and may not be representative of actual results.  Changes in assumptions can materially affect estimates of fair values. The following weighted average assumptions were used to estimate the weighted average grant date fair values for the nine-month periods ended September 30, 2017 and September 30, 2016:

	September 30, 2017	September 30, 2016
Expected stock price volatility	84.52%	87.97%
Expected life of options	5.00 years	5.00 years
Risk free interest rate	1.15%	0.69%
Expected forfeitures	0%	0%
Expected dividend yield	0%	0%
Weighted average fair value per option granted in period	$2.04	$1.80

Share-based payments for options vested for the nine months ended September 30, 2017 amounted to $6,757,365 (2016 – $6,350,931) of which $5,034,528 (2016 – $4,513,895) was expensed to the statement of loss (profit) and comprehensive loss (profit) and $1,722,837 (2016 - $1,837,036) was capitalized to exploration and evaluation assets (Note 5).

16

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

10. RELATED PARTY TRANSACTIONS

Key management personnel include those persons having authority and responsibility for planning, directing and controlling the activities of the Company as a whole. The Company has determined that key management personnel consists of executive and non-executive members of the Company's Board of Directors, corporate officers and related companies.

Remuneration attributed to key management personnel can be summarized as follows:

	For the nine months ended
	September 30, 2017		September 30, 2016
Short-term compensation(1)	$	2,856,509	$	1,905,920
Share-based payments (stock options)(2)		4,858,629		4,444,383
	$	7,715,138	$	6,350,303

⁽¹⁾ Short-term compensation to key management personnel for the nine months ended September 30, 2017 amounted to $2,856,509 (2016 - $1,905,920) of which $2,340,533 (2016 - $1,417,248) was expensed and included in salaries, benefits and directors' fees on the statement of loss and comprehensive loss. The remaining $515,976 (2016 - $488,672) was capitalized to exploration and evaluation assets.

⁽²⁾ Share-based payments to key management personnel for the nine months ended September 30, 2017 amounted to $4,858,629 (2016 - $4,444,383) of which $4,250,675 (2016 - $4,047,676) was expensed and $607,954 (2016 - $396,707) was capitalized to exploration and evaluation assets.

As at September 30, 2017, there was $nil (December 31, 2016 - $15,000) included in accounts payable and accrued liabilities owing to its directors and officers for compensation.

On October 15, 2015, two corporate officers of the Company were appointed to the Board of Directors of NxGold. During the period ended September 30, 2017, one of the Company's directors was appointed as a corporate officer of NxGold and two of the Company's directors were appointed as directors of NxGold.

On February 26, 2016, the Company issued 49,861 common shares to NxGold on the exercise of its option to acquire the remaining 25% interest in the Madison and 2Z properties held by NxGold (Note 5).

11. CAPITAL MANAGEMENT

The Company manages its capital structure and makes adjustments to it, based on the funds available to the Company, in order to support the acquisition, exploration and evaluation of assets. The Board of Directors does not establish quantitative return on capital criteria for management, but rather relies on the expertise of the Company's management to sustain the future development of the business.

In the management of capital, the Company considers all components of equity and debt and is dependent on third party financing, whether through debt, equity, or other means.  Although the Company has been successful in raising funds to date, there is no assurance that the Company will be successful in obtaining required financing in the future or that such financing will be available on terms acceptable to the Company.

The properties in which the Company currently has an interest are in the exploration stage. As such the Company has historically relied on the equity markets to fund its activities. The Company will continue to assess new properties and seek to acquire an interest in additional properties if it determines that there is sufficient geologic or economic potential and if it has adequate financial resources to do so.

Management reviews its capital management approach on an on-going basis and believes that this approach, given the relative size of the Company, is reasonable.

The Company is not subject to externally imposed capital requirements. There were no changes in the Company's approach to capital management during the period.

12. FINANCIAL INSTRUMENTS

The Company's financial instruments consist of cash and cash equivalents, amounts receivable, accounts payable and accrued liabilities and the Convertible Debentures.

The fair values of the Company's cash and cash equivalents, amounts receivable and accounts payable and accrued liabilities approximate their carrying value, due to their short-term maturities or liquidity. The Company's cash and cash equivalents are classified as loans and receivables and are initially recorded at fair value and subsequently at amortized cost with accrued interest recorded in amounts receivable.

17

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

12. FINANCIAL INSTRUMENTS (continued)

Fair Value Measurement

The Company classifies the fair value of financial instruments according to the following hierarchy based on the amount of observable inputs used to value the instrument:

· Level 1 – quoted prices in active markets for identical assets or liabilities.

· Level 2 –  inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly (i.e. as prices) or indirectly (i.e. derived from prices).

· Level 3 – inputs for the asset or liability that are not based on observable market data.

The Convertible Debentures are re-measured at fair value at each reporting date with any change in fair value recognized in profit or loss (Note 8). The Convertible Debentures are classified as Level 2.

As at September 30, 2017, the Company's risk exposures and the impact on the Company's financial instruments are summarized below:

(a)Credit Risk

Credit risk is the risk that one party to a financial instrument will fail to discharge an obligation and cause the other party to incur a financial loss. Financial instruments potentially subject to credit risk are cash and cash equivalents and amounts receivable. The Company holds cash and cash equivalents with large Canadian and Australian banks. Credit risk is concentrated as a large portion of the Company's cash and cash equivalents is held at one financial institution. Management believes the risk of loss to be remote. The Company's amounts receivable consists of input tax credits receivable from the Government of Canada and interest accrued on cash equivalents. Accordingly, the Company does not believe it is subject to significant credit risk.

(b)Liquidity Risk

Liquidity risk is the risk that an entity will encounter difficulty in raising funds to meet commitments associated with financial instruments. The Company attempts to manage liquidity risk by maintaining sufficient cash and cash equivalent balances. Liquidity requirements are managed based on expected cash flows to ensure that there is sufficient capital to meet short-term obligations. The Company's approach to managing liquidity risk is to ensure that it will have sufficient liquidity to meet liabilities when due. As at September 30, 2017, NexGen had cash and cash equivalents of $180,725,909 to settle accounts payable and accrued liabilities of $7,555,430.

(c)Market Risk

Market risk is the risk of loss that may arise from changes in market factors such as interest rates, foreign exchange rates and commodity and equity prices.

(i)Interest Rate Risk

Interest rate risk is the risk that the future cash flows of a financial instrument will fluctuate due to changes in market interest rates. The Company holds its cash and cash equivalents in bank accounts that earn variable interest rates. Due to the short‑term nature of these financial instruments, fluctuations in market rates do not have a significant impact on the estimated fair value of the Company's cash and cash equivalent balances as of September 30, 2017. The Company manages interest rate risk by maintaining an investment policy for short‑term investments. This policy focuses primarily on preservation of capital and liquidity. The Company monitors the investments it makes and is satisfied with the credit rating of its banks. The Convertible Debentures, in an aggregate principal amount of US$120 million, carry a fixed interest rate of 7.5% and hence, are not subject to interest rate fluctuations.

(ii)Foreign Currency Risk

The functional currency of the Company and its subsidiaries is the Canadian dollar. The Company is affected by currency transaction risk and currency translation risk. Consequently, fluctuations of the Canadian dollar in relation to other currencies impact the fair value of financial assets, liabilities and operating results. Financial assets and liabilities subject to currency translation risk primarily include Australian and US dollar denominated cash and Australian and US dollar accounts payable and accrued liabilities. The Company maintains an Australian dollar bank account in Australia and Canadian and US dollar bank accounts in Canada.

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NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

12. FINANCIAL INSTRUMENTS (continued)

(ii)Foreign Currency Risk, continued

The Company is exposed to foreign exchange risk on its US dollar denominated Convertible Debentures. At maturity the US$120 million principal amount of the Convertible Debentures is due in full, and prior to then at a premium upon the occurrence of certain events, including a change of control. The Company holds sufficient US dollars to make all cash interest payments due under the Convertible Debentures until maturity but not to pay the principal amount.  Accordingly, the Company is subject to risks associated with fluctuations in the Canadian/US dollar exchange rate that may make the Convertible Debentures more costly to repay.

(iii)Price risk

The Company is exposed to price risk with respect to commodity and equity prices. Equity price risk is defined as the potential adverse impact on the Company's earnings due to movements in individual equity prices or general movements in the level of the stock market. Accordingly, significant movements in the Company's share price may affect the valuation of the Convertible Debentures which may adversely impact its earnings.

Commodity price risk is defined as the potential adverse impact on earnings and economic value due to commodity price movements and volatility. Future declines in commodity prices may impact the valuation of long-lived assets. The Company closely monitors commodity prices of uranium, individual equity movements, and the stock market to determine the appropriate course of action, if any, to be taken by the Company.

Sensitivity Analysis

As at September 30, 2017, the Company's Australian dollar net financial assets were AUD $10,055 and its US dollar net financial liabilities were US$91,330,350. Thus a 10% change in the Canadian dollar versus the Australian and US dollar exchange rates would give rise to a $9,507,142 change in loss (profit) and comprehensive loss (profit).

The Company has not entered into any agreements or purchased any instruments to hedge possible currency risks at this time.

13. SEGMENT INFORMATION

The Company operates in one reportable segment, being the acquisition, exploration and development of uranium properties. All of the Company's non-current assets are located in Canada.

14. SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS

The significant non-cash transactions during the nine-month period ended September 30, 2017 included:

a) At September 30, 2017, $4,056,626 of exploration and evaluation asset expenditures and $162,187 of equipment expenditures were included in accounts payable and accrued liabilities.

b) At September 30, 2017, $2,515,134 of interest expense related to the convertible debentures was included in accounts payable and accrued liabilities.  On June 12, 2017, the Company issued 327,863 common shares valued at $963,917 for the non-cash portion of the convertible debenture interest payment.

c) Share-based payments of $1,722,837 was included in exploration and evaluation assets (Note 5).

d) The re-allocation upon exercise of stock options from reserves to share capital of $603,535.

e) The Company issued 111,110 common shares to acquire the remaining 40% interest in the Dufferin Lake property recorded at the estimated fair value of the common shares of $333,330 (Note 5).

f) IsoEnergy issued an aggregate of 4,000,000 common shares for the acquisition of mineral properties recorded at the estimated fair value of the common shares of $3,040,000 (Note 5).

19

NEXGEN ENERGY LTD.

NOTES TO THE CONDENSED CONSOLIDATED INTERIM FINANCIAL STATEMENTS

(Expressed in Canadian Dollars)

(Unaudited)

FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2017 & 2016

14. SUPPLEMENTAL DISCLOSURE WITH RESPECT TO CASH FLOWS (continued)

The significant non-cash transactions during the nine-month period ended September 30, 2016 included:

a) The re-allocation upon exercise of warrants from reserves to share capital of $934,361.

b) At September 30, 2016, $2,152,848 of exploration and evaluation asset expenditures and $235,790 of equipment expenditures were included in accounts payable and accrued liabilities.

c) At September 30, 2016, $1,788,890 of interest expense related to the convertible debentures was included in accounts payable and accrued liabilities.

d) Share-based payments of $1,837,036 was included in exploration and evaluation assets (Note 5).

e) The re-allocation upon exercise of stock options from reserves to share capital of $285,853.

f) IsoEnergy issued 1,000,000 of its common shares for the acquisition of a mineral property recorded at the estimated fair value of the common shares of $1,000,000 (Note 5).

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