The leased gold outstanding and not yet returned during the period.

No definition available.

Name:	kgji_GoldLeaseOutstanding
Namespace Prefix:	kgji_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant

- Definition

The quntity of gold secured.

+ References

No definition available.

+ Details

Name:	kgji_GoldQuantitySecured
Namespace Prefix:	kgji_
Data Type:	num:massItemType
Balance Type:	na
Period Type:	instant

- Definition

Additional borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

Name:	kgji_LineOfCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	kgji_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the terms on the loan agreement.

+ References

No definition available.

+ Details

Name:	kgji_LoanAgreementTerms
Namespace Prefix:	kgji_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of assets pledged to secure a debt instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentCollateralAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateRangeEnd1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateRangeStart1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

+ References

+ Details

Name:	us-gaap_DepositAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate amount of interest paid or due on all long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.8)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

+ Details

Name:	us-gaap_InterestExpenseLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.7)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

+ Details

Name:	us-gaap_InterestExpenseShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

+ Details

Name:	us-gaap_LongTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for loan origination associated cost which is usually collected through escrow.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_PaymentsOfLoanCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ProceedsFromLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585

+ Details

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

+ References

No definition available.

+ Details

Name:	us-gaap_RestrictedInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

+ Details

Name:	us-gaap_SecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Weighted average interest rate of short-term debt outstanding calculated at point in time.

+ References

+ Details

Name:	us-gaap_ShortTermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	kgji_LoanAgreementAxis=kgji_FirstLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	kgji_LoanAgreementAxis=kgji_SecondLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_YangtaiHuangshanRoadBranchOfEvergrowingBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_NationalTrustLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_AnxinTrustCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_MinshengTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_SichuanTrustLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_ChinaAviationCapitalInvestmentManagementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_ChinaConstructionInvestmentTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_ZheshangjinhuitrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_ZhongjianginternationaltrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_LoansPayableToChinaAviationTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_HuarongTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_LoansPayableToChanganTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_ChinaConstructionBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=kgji_LoansPayableToDongguanTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LOANS - Additional Information (Detail) ¥ in Millions				1 Months Ended																						3 Months Ended				9 Months Ended				12 Months Ended
LOANS - Additional Information (Detail) ¥ in Millions	Nov. 07, 2016 USD ($) g	Sep. 07, 2016 USD ($) g kg	Sep. 07, 2016 CNY (¥)	Oct. 31, 2018 USD ($)	Oct. 31, 2018 CNY (¥)	Oct. 10, 2018 USD ($) g	Sep. 30, 2018 USD ($)	Sep. 30, 2018 CNY (¥)	Jul. 31, 2018 USD ($) kg	Jul. 31, 2018 CNY (¥)	Dec. 26, 2017 USD ($) g	Dec. 26, 2017 CNY (¥)	Nov. 30, 2017 USD ($) g	Nov. 30, 2017 CNY (¥)	Sep. 30, 2017 USD ($) g	Sep. 30, 2017 CNY (¥)	Feb. 28, 2017 USD ($) g	Feb. 28, 2017 CNY (¥)	Jan. 25, 2017 USD ($) g	Jan. 25, 2017 CNY (¥)	Dec. 23, 2016 USD ($) g	Dec. 23, 2016 CNY (¥)	Sep. 07, 2016 USD ($) g kg	Aug. 29, 2016 USD ($) g	Jan. 31, 2016 USD ($) g	Sep. 30, 2018 USD ($)	Sep. 30, 2018 CNY (¥)	Sep. 30, 2017 USD ($) g	Sep. 30, 2017 CNY (¥)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 CNY (¥)	Sep. 30, 2017 USD ($) g	Sep. 30, 2017 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Oct. 10, 2018 CNY (¥) g	Sep. 30, 2018 g	Sep. 30, 2018 kg	Sep. 30, 2018 CNY (¥)	Sep. 30, 2018	Jul. 31, 2018 CNY (¥) kg	Dec. 31, 2017 USD ($)	Dec. 26, 2017 CNY (¥) g	Nov. 30, 2017 CNY (¥) g	Sep. 30, 2017 CNY (¥) g	Aug. 23, 2017 USD ($)	Aug. 23, 2017 CNY (¥)	Feb. 28, 2017 CNY (¥) g	Feb. 23, 2017 USD ($)	Feb. 23, 2017 CNY (¥)	Jan. 25, 2017 CNY (¥) g	Dec. 23, 2016 CNY (¥) g	Nov. 07, 2016 CNY (¥) g	Sep. 07, 2016 CNY (¥) g kg	Aug. 29, 2016 CNY (¥) g	Aug. 23, 2016 CNY (¥)	Mar. 24, 2016 USD ($)	Mar. 24, 2016 CNY (¥)	Jan. 31, 2016 CNY (¥) g
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate						10.50%																														10.50%				11.00%
Restricted cash							$ 15,494,955																			$ 15,494,955				$ 15,494,955												$ 12,927,272
Debt Instrument, Collateral Amount							1,953,600,000																			1,953,600,000				1,953,600,000									¥ 635.9			$ 2,131,600,000
Line of Credit Facility, Maximum Borrowing Capacity						$ 145,600,000	145,600,000																			145,600,000				145,600,000						¥ 1.0			1,000.0
Long-term Debt, Total						$ 208,000,000	$ 166,000,000																			166,000,000				$ 166,000,000						¥ 1.4			1,140.2										$ 145,596
Gold Lease Outstanding						5,356																														5,356	4,974	57,476
Debt Instrument, Term							1 month	1 month																						18 months	18 months
Payments of Loan Costs																														$ 6,578,966		$ 4,114,687
Amortization of Debt Issuance Costs																										$ 3,482,031		$ 1,347,832		8,042,451		7,751,818
Repayments of Long-term Debt																														0		102,695,952
Debt Instrument, Interest Rate Terms																										The Company is required to pay interest based on a fixed annual interest rate of 10% and a one-time consulting fee of 3% based on the principal amount extended as loan origination fee.	The Company is required to pay interest based on a fixed annual interest rate of 10% and a one-time consulting fee of 3% based on the principal amount extended as loan origination fee.
Proceeds from Issuance of Long-term Debt																														$ 435,804,951		96,966,135
Loan Agreement Terms																														The loan agreements also required that Company to maintain an asset-liability ratio less than 90% and current ratio over 1. The Company is not allowed to increase contingent liabilities without notice to the bank, the balance of contingent liabilities should be no larger than RMB 3.05 billion, contingent asset-liability ratio should be less than 60%.	The loan agreements also required that Company to maintain an asset-liability ratio less than 90% and current ratio over 1. The Company is not allowed to increase contingent liabilities without notice to the bank, the balance of contingent liabilities should be no larger than RMB 3.05 billion, contingent asset-liability ratio should be less than 60%.
First Loan Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																																								4.35%
Long-term Debt, Total							$ 17,200,000																			$ 17,200,000				$ 17,200,000									118.0
Debt Instrument, Maturity Date							Sep. 19, 2019	Sep. 19, 2019
Second Loan Agreement [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs \| ¥																																	¥ 3.3
Maximum [Member]
Debt Instrument [Line Items]
Debt Instrument, Term						18 months
Minimum [Member]
Debt Instrument [Line Items]
Debt Instrument, Term						12 months
Amortization of Debt Issuance Costs \| ¥																																	1.1
Yangtai Huangshan Road Branch of Evergrowing Bank [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																																								6.50%																	4.75%	4.75%
Debt Instrument, Collateral Amount							$ 92,600,000																			92,600,000				92,600,000
Long-term Debt, Total							72,800,000																			72,800,000				72,800,000									500.0							$ 145,596	¥ 1.0		$ 145,596	¥ 1.0						¥ 1.0	$ 145,600,000	¥ 1,000.0
Repayments of Long-term Debt																														72,400,000	¥ 497.0
Gold quantity secured \| kg																																						2,735
The National Trust Ltd [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																	8.617%																															8.617%
Secured Debt																	$ 59,400,000																															¥ 408.1
Line of Credit Facility, Maximum Borrowing Capacity																	$ 50,900,000																															¥ 350.0
Gold Lease Outstanding \| g																	1,745																															1,745
Debt Instrument, Term																	24 months	24 months
Payments of Loan Costs																	$ 400,000	¥ 2.6
Amortization of Debt Issuance Costs																										50,000	¥ 0.3	50,000	¥ 0.3	100,000	0.9	100,000	0.7
Anxin Trust Co., Ltd [Member]
Debt Instrument [Line Items]
Interest Expense, Short-term Borrowings																										21,300,000		$ 9,700,000		62,800,000		$ 29,700,000
Restricted cash							3,500,000																			3,500,000				3,500,000									24.0
Secured Debt																									$ 523,000,000																																		¥ 3,600.0
Short-term Debt, Weighted Average Interest Rate, at Point in Time															6.50%													6.50%				6.50%								8.90%					6.50%
Long-term Debt, Total																									$ 436,800,000																																		¥ 3.0
Gold Lease Outstanding \| g																									15,450																																		15,450
Debt Instrument, Term																									60 months
Repayments of Long-term Debt																										80,100,000	550.0
Anxin Trust Co., Ltd [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																									14.80%																																		14.80%
Anxin Trust Co., Ltd [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																									11.00%																																		11.00%
Minsheng Trust [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate											9.20%																																9.20%
Restricted cash							2,200,000																			2,200,000				2,200,000									15.0
Secured Debt \| ¥																																											¥ 1,900.0
Line of Credit Facility, Maximum Borrowing Capacity											$ 218,400,000																																¥ 1,500.0
Debt Instrument, Term											30 months	30 months
Payments of Loan Costs											$ 3,800,000	¥ 25.9
Amortization of Debt Issuance Costs																										1,500,000	¥ 9.6			1,500,000	9.6
Proceeds from Lines of Credit											$ 270,600,000																			218,400,000	1.5
Gold quantity secured \| g											7,887																																7,887
Sichuan Trust Ltd [Member]
Debt Instrument [Line Items]
Restricted cash		$ 2,200,000																					$ 2,200,000																															¥ 15.0
Secured Debt							218,400,000																			$ 218,400,000				218,400,000									1,500.0
Debt Instrument, Interest Rate, Stated Percentage		8.46%																					8.46%																	8.10%														8.46%
Line of Credit Facility, Maximum Borrowing Capacity		$ 291,200,000																					$ 291,200,000																															¥ 2,000.0
Long-term Debt, Total		$ 245,700,000																					$ 245,700,000																															¥ 1,700.0
Debt Instrument, Maturity Date Range, Start																							Sep. 20, 2018			Nov. 20, 2019	Nov. 20, 2019
Debt Instrument, Maturity Date Range, End																							Nov. 30, 2018			Jan. 30, 2020	Jan. 30, 2020
Gold Lease Outstanding \| g		7,258																					7,258																															7,258
Payments of Loan Costs																																		$ 5,300,000	¥ 36.3
Amortization of Debt Issuance Costs																										$ 600,000	¥ 4.4	$ 400,000	2.3	2,100,000	13.4	$ 1,000,000	6.8
Debt, Weighted Average Interest Rate		1.21%																					1.21%																															1.21%
China Aviation Capital Investment Management [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate During Period		3.00%	3.00%
Line Of Credit Facility Additional Borrowing Capacity \| ¥																																																						¥ 600.0
Debt Instrument, Interest Rate, Stated Percentage		7.50%																					7.50%																															7.50%
Debt Instrument, Collateral Amount		$ 49,900,000																					$ 49,900,000																															¥ 342.5
Line of Credit Facility, Maximum Borrowing Capacity		$ 87,400,000																					$ 87,400,000
Long-term Debt, Total							42,200,000																			42,200,000				42,200,000
Gold Lease Outstanding \| kg		1,473																					1,473																															1,473
Payments of Loan Costs		$ 42,200,000	¥ 290.0																											1,300,000	8.7	200,000
Amortization of Debt Issuance Costs																										100,000	0.8			500,000	3.0	500,000
China Aviation Capital Investment Management [Member] \| Second Loan Agreement [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs \| ¥																																	0.3
China Construction Investment Trust [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																								7.50%																															7.50%
Restricted cash																								$ 500,000																															¥ 3.0
Debt Instrument, Collateral Amount																								49,000,000																															336.4
Line of Credit Facility, Maximum Borrowing Capacity																								$ 43,700,000																															¥ 300.0
Long-term Debt, Total															$ 500,000													$ 500,000				500,000													¥ 3.0
Gold Lease Outstanding \| g																								1,447																															1,447
Debt Instrument, Term																								24 months
Payments of Loan Costs																														400,000	3.0
Amortization of Debt Issuance Costs																										100,000	0.3			200,000		$ 200,000	1.0
Repayments of Debt																										43,200,000	297.0
China Construction Investment Trust [Member] \| First Loan Agreement [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs \| ¥																											0.3
China Construction Investment Trust [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs																										40,000
Zheshang Jinhui Trust [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate	7.80%												7.70%																															7.70%									7.80%
Restricted cash							91,900,000																			91,900,000				91,900,000									631.4
Secured Debt	$ 91,700,000																																																				¥ 629.6
Debt Instrument, Collateral Amount													$ 110,400,000																															¥ 758.5
Line of Credit Facility, Maximum Borrowing Capacity	$ 80,100,000												$ 145,600,000																															1,000.0									¥ 550.0
Gold Lease Outstanding \| g	2,708																																																				2,708
Debt Instrument, Term	24 months												24 months	24 months
Restricted Investments	$ 800,000												$ 920,000																															¥ 6.3									¥ 5.5
Payments of Loan Costs													$ 1,400,000	¥ 9.5
Amortization of Debt Issuance Costs																										300,000	1.9			900,000	5.6
Gold quantity secured \| g													3,264																															3,264
Zhongjiang International Trust [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate															9.80%						8.75%							9.80%				9.80%								8.90%					9.80%							8.75%
Secured Debt																					$ 71,200,000																															¥ 489.2
Line of Credit Facility, Maximum Borrowing Capacity																					$ 58,200,000																															¥ 400.0
Interest Expense, Long-term Debt																										15,300,000		$ 17,400,000		53,000,000		$ 66,200,000
Gold Lease Outstanding \| g																					2,104																															2,104
Debt Instrument, Periodic Payment \| ¥																						¥ 1.9
Debt Instrument, Term																					24 months	24 months
Payments of Loan Costs																					$ 300,000
Amortization of Debt Issuance Costs																										30,000	0.2	40,000	0.2	100,000	0.7	100,000	0.7
Loans payable to China Aviation Trust [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate																			8.00%																																8.00%
Secured Debt																			$ 55,100,000																																¥ 378.4
Line of Credit Facility, Maximum Borrowing Capacity																			$ 45,100,000																																¥ 310.0
Gold Lease Outstanding \| g																			1,647																																1,647
Debt Instrument, Term																			24 months	24 months
Restricted Investments																			$ 500,000																																¥ 3.1
Payments of Loan Costs																			$ 1,400,000	¥ 9.3
Amortization of Debt Issuance Costs																										200,000	1.2	200,000	1.2	500,000	3.5	$ 500,000	3.2
Huarong Trust [Member]
Debt Instrument [Line Items]
Payments of Loan Costs																														2,100,000	14.3
Amortization of Debt Issuance Costs																										200,000	1.5	$ 0.3	¥ 2.0	1,300,000	8.6		¥ 2.0
Loans Payable to Changan Trust [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate															10.00%													10.00%				10.00%													10.00%
Debt Instrument, Collateral Amount															$ 163,600,000													$ 163,600,000				$ 163,600,000													¥ 1,100.0
Line of Credit Facility, Maximum Borrowing Capacity															$ 145,600,000													145,600,000				145,600,000													1,000.0
Debt Instrument, Term															24 months	24 months
Restricted Investments															$ 1,500,000													$ 1,500,000				$ 1,500,000													¥ 10.0
Payments of Loan Costs															$ 1,500,000	¥ 11.0
Amortization of Debt Issuance Costs																										200,000	1.4			600,000	4.1
Gold quantity secured \| g															4,784													4,784				4,784													4,784
Repayments of Debt							2,900,000	¥ 20.0
Loans Payable to Changan Trust [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Repayments of Debt				$ 25,900,000	¥ 178.2
China Construction Bank [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity							30,300,000																			30,300,000				30,300,000
China Construction Bank [Member] \| Second Loan Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																																								4.35%
Long-term Debt, Total							$ 25,000,000																			25,000,000				25,000,000									¥ 172.0
Debt Instrument, Term							1 year	1 year
Debt Instrument, Maturity Date							Sep. 25, 2019	Sep. 25, 2019
Proceeds from Issuance of Long-term Debt							$ 13,100,000	¥ 90.0
Loans Payable To Dongguan Trust [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage									11.00%																																11.00%
Debt Instrument, Collateral Amount									$ 166,000,000																																¥ 1,140.2
Line of Credit Facility, Maximum Borrowing Capacity									$ 145,600,000																																¥ 1,000.0
Debt Instrument, Term									18 months	18 months
Payments of Loan Costs									$ 2,200,000	¥ 15.0
Amortization of Debt Issuance Costs																										$ 200,000	¥ 1.4			$ 200,000	¥ 1.4
Gold quantity secured \| kg									4,974																																4,974
Deposit Assets									$ 1,500,000																																¥ 10.0