The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

+ References

+ Details

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

- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=BHLL_StockOptionsOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=BHLL_CanadaDollarsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=BHLL_StockOptionsTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=BHLL_StockOptionsThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=BHLL_StockOptionsFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=BHLL_StockOptionsFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=BHLL_StockOptionsSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Schedule of Stock Option Issued and Outstanding (Details)	6 Months Ended	9 Months Ended
	Dec. 31, 2020 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2020 shares	Jun. 30, 2020 shares	Dec. 31, 2019 shares	Jun. 30, 2019 shares
Subsidiary, Sale of Stock [Line Items]
Number of stock options outstanding	8,015,159	9,053,136	7,780,159	7,580,159	1,692,500	287,100
Number of options vested (exercisable)	1,257,500	3,520,186
Grant date fair value \| $	$ 2,329,032	$ 2,533,245
Stock Options One [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares		$ 10.00
Weighted average remaining contractual life (years)	1 year 3 months 29 days	7 months 2 days
Number of stock options outstanding	47,500	47,500
Number of options vested (exercisable)	47,500	47,500
Grant date fair value \| $	$ 258,013	$ 258,013
Stock Options One [Member] \| CAD [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares	$ 10.00
Stock Options Two [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares		$ 0.50
Weighted average remaining contractual life (years)	2 years	1 year 3 months
Number of stock options outstanding	235,000	235,000
Number of options vested (exercisable)	235,000	235,000
Grant date fair value \| $	$ 46,277	$ 46,277
Stock Options Two [Member] \| CAD [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares	$ 0.50
Stock Options Three [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares		$ 0.60
Weighted average remaining contractual life (years)	2 years 9 months	2 years
Number of stock options outstanding	200,000	200,000
Number of options vested (exercisable)		200,000
Grant date fair value \| $	$ 52,909	$ 52,909
Stock Options Three [Member] \| CAD [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares	$ 0.60
Stock Options Four [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares		$ 0.60
Weighted average remaining contractual life (years)	3 years 9 months 25 days	3 years 25 days
Number of stock options outstanding	1,575,000	1,575,000
Number of options vested (exercisable)	975,000	1,275,000
Grant date fair value \| $	$ 435,069	$ 435,069
Stock Options Four [Member] \| CAD [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares	$ 0.60
Stock Options Five [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares		$ 0.55
Weighted average remaining contractual life (years)	4 years 3 months 18 days	3 years 6 months 21 days
Number of stock options outstanding	5,957,659	5,957,659
Number of options vested (exercisable)		1,489,415
Grant date fair value \| $	$ 1,536,764	$ 1,536,764
Stock Options Five [Member] \| CAD [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares	$ 0.55
Stock Options Six [Member]
Subsidiary, Sale of Stock [Line Items]
Exercise price \| $ / shares		$ 0.335
Weighted average remaining contractual life (years)		4 years 4 months 20 days
Number of stock options outstanding		1,037,977
Number of options vested (exercisable)		273,271
Grant date fair value \| $		$ 204,213