XML 34 R36.htm IDEA: XBRL DOCUMENT
v2.4.0.6

GOLD AND SILVER BULLION (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
GOLD AND SILVER BULLION |  |  |  |
Total cost | $ 12,963,000 | $ 12,963,000 |  | $ 22,810,000
Changes in the Company's holdings of gold and silver |  |  |  |
Opening Balance |  | 22,810,000 | 4,569,000 | 4,569,000
Purchases |  |  | 31,299,000 | 31,299,000
Proceeds from sale |  | (11,330,000) | (2,173,000) | (11,739,000)
Gain on sale | 434,000 | 1,842,000 | 524,000 | 2,075,000
Unrealized loss on silver bullion | (359,000) | (359,000) |  | (3,394,000)
Ending Balance | 12,963,000 | 12,963,000 |  | 22,810,000
Gold |  |  |  |
GOLD AND SILVER BULLION |  |  |  |
# of ounces | 3,223 | 3,223 |  | 5,656
Average cost per ounce (in dollars per ounce) | 1,278.63 | 1,278.63 |  | 1,278.63
Total cost | 4,121,000 | 4,121,000 |  | 7,232,000
Fair value per ounce (in dollars per ounce) | 1,598.50 | 1,598.50 |  | 1,574.50
Total fair value | 5,152,000 | 5,152,000 |  | 8,905,000
Quantity sold (in ounces) |  | 2,433 |  |
Cost of investments sold |  | 3,100,000 |  |
Changes in the Company's holdings of gold and silver |  |  |  |
Opening Balance |  | 7,232,000 | 4,569,000 | 4,569,000
Purchases |  |  |  | 7,387,000
Proceeds from sale |  | (4,026,000) |  | (6,218,000)
Gain on sale |  | 915,000 |  | 1,494,000
Ending Balance | 4,121,000 | 4,121,000 |  | 7,232,000
Silver |  |  |  |
GOLD AND SILVER BULLION |  |  |  |
# of ounces | 326,512 | 326,512 |  | 552,812
Average cost per ounce (in dollars per ounce) | 27.08 | 27.08 |  | 28.18
Total cost | 8,842,000 | 8,842,000 |  | 15,578,000
Fair value per ounce (in dollars per ounce) | 27.08 | 27.08 |  | 28.18
Total fair value | 8,842,000 | 8,842,000 |  | 15,578,000
Quantity sold (in ounces) |  | 226,299 |  |
Cost of investments sold |  | 6,400,000 |  |
Changes in the Company's holdings of gold and silver |  |  |  |
Opening Balance |  | 15,578,000 |  |
Purchases |  |  |  | 23,912,000
Proceeds from sale |  | (7,304,000) |  | (5,521,000)
Gain on sale |  | 927,000 |  | 581,000
Unrealized loss on silver bullion |  | (359,000) |  | (3,394,000)
Ending Balance | $ 8,842,000 | $ 8,842,000 |  | $ 15,578,000

X
- Definition Represents the cost of physical commodities sold by the entity during the period. + References No definition available. + Details
Name: | mux_CostOfInvestmentInPhysicalCommoditiesSold
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the average cost per unit of physical commodities held by the entity as of the balance sheet date. + References No definition available. + Details
Name: | mux_InvestmentInPhysicalCommoditiesAverageCostPerUnit
Namespace Prefix: | mux_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the fair value per unit of physical commodities held by the entity as of the balance sheet date. + References No definition available. + Details
Name: | mux_InvestmentInPhysicalCommoditiesFairValuePerUnit
Namespace Prefix: | mux_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the quantity of physical commodities sold by the entity during the period. + References No definition available. + Details
Name: | mux_InvestmentInPhysicalCommoditiesQuantitySold
Namespace Prefix: | mux_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | mux_InvestmentInPhysicalCommoditiesRollForward
Namespace Prefix: | mux_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentHoldingsOtherThanSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investments held in physical commodities, such as gold, silver, platinum, crude oil, coal, sugar, rice, wheat. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 12 -Article 5 + Details
Name: | us-gaap_InvestmentInPhysicalCommodities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investments held in physical commodities, such as gold, silver, platinum, crude oil, coal, sugar, rice, wheat. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 33 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_InvestmentInPhysicalCommoditiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Quantity of the investment. Indicate the measure in the unit of measure. This is commonly used for investments other than securities. For example, if the investment is gold, the balance would be the number of ounces and the unit of measure would indicate "ounces". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.2, Column B) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611282-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph Column B -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 13 -Paragraph 2 -Article 12 + Details
Name: | us-gaap_InvestmentOwnedBalanceOtherMeasure
Namespace Prefix: | us-gaap_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_PaymentsToAcquireInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3521-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3574-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 31 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_ProceedsFromSaleOfOtherInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration