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Reclamation and Environmental - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($)
Site Contingency [Line Items] |  |  |
Commutation account | $ 1,769,501 |  | $ 2,086,562
Asset retirement obligation | 1,072,551 | $ 1,402,039 | 1,261,034
Asset retirement obligation, current | 101,593 |  | 216,101
Asset retirement obligation, noncurrent | 970,958 |  | 1,044,933
Sleeper Gold Project |  |  |
Site Contingency [Line Items] |  |  |
Maximum reclamation costs covered by insurance policy | 25,000,000 |  |
Commutation account | 1,769,501 |  | $ 2,086,562
Undiscounted estimate of reclamation costs | $ 3,835,050 |  |
Inflation rate | 2.00% | 2.00% |
Sleeper Gold Project | Measurement Input Risk Free Interest Rate |  |  |
Site Contingency [Line Items] |  |  |
Credit adjusted risk free rate | 9.76 | 9.76 |

X
- Definition Estimated amount of a reclamation cost that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and re-vegetation of waste rock piles and other disturbed areas, before the discount of interest rate and inflation rate assumptions. + References No definition available. + Details
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- Definition Inflation rate assumption used in valuing an estimate of reclamation costs. + References No definition available. + Details
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- Definition Noncurrent bond posted used to reimburse reclamation costs and indemnity claims paid by the Company. + References No definition available. + Details
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- Definition Value of input used to measure alternative investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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