Acquisition of Mason (Narrative) (Details) - Mason Resources Corp. ("Mason") $ / shares in Units, $ in Thousands, $ in Thousands	1 Months Ended
Dec. 18, 2018 USD ($)	Dec. 19, 2018 USD ($)	Dec. 19, 2018 CAD ($) $ / shares	Dec. 18, 2018 CAD ($)
Statements [Line Items]
Acquisition cost per share			$ 0.40
Total cash consideration, including transaction costs		$ 20,797	$ 27,972
Cash		20,126	27,070
Transaction costs		$ 671	$ 902
Equity instruments held	$ 3,228			$ 4,342
Ownership percentage	13.80%

Represents per share value of remaining issued and outstanding shares.

No definition available.

Name:	hbm_AcquiredRemainingIssuedAndOutstandingPerShare
Namespace Prefix:	hbm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

Name:	hbm_AcquisitionDateCostOfAcquiredEntityTransactionCosts
Namespace Prefix:	hbm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The fair value, at acquisition date, of the consideration transferred including transaction cost in a business combination.

+ References

No definition available.

+ Details

Name:	hbm_AcquisitionDateFairValueOfIncludingTransactionCosts
Namespace Prefix:	hbm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Statements [Line Items]

+ References

No definition available.

+ Details

Name:	hbm_StatementsLineItems
Namespace Prefix:	hbm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value, at acquisition date, of cash transferred as consideration in a business combination. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2017-01-01
-Paragraph B64
-Subparagraph f
-Clause i
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B64_f_i&doctype=Appendix&seq=2
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_CashTransferred
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of instruments held by the entity that provide evidence of a residual interest in the assets of another entity after deducting all of its liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_EquityInstrumentsHeld
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2017-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard
-URIDate 2017-03-09

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2017-01-01
-Paragraph 19B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_19B_c&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_BusinessCombinationsAxis=hbm_MasonResourcesCorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: