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STOCK BASED COMPENSATION (Details) | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  |  | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 19, 2006 | Jan. 31, 2013 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Jan. 19, 2012 | Oct. 03, 2005 | Oct. 02, 2005 | Dec. 31, 2013 Minimum | Dec. 31, 2011 Minimum | Dec. 31, 2013 Maximum | Dec. 31, 2011 Maximum | Jan. 24, 2012 Minera Andes CAD | Dec. 31, 2013 Minera Andes USD ($) | Dec. 31, 2012 Minera Andes USD ($) | Dec. 31, 2013 Certain employees and directors USD ($) | Dec. 31, 2012 Certain employees and directors USD ($) | Dec. 31, 2011 Certain employees and directors USD ($)
STOCK BASED COMPENSATION |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance | 9,000,000 |  |  |  |  |  | 13,500,000 | 5,000,000 | 3,500,000 |  |  |  |  |  |  |  |  |  |
Number of shares increased under the US Gold Plan | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares that may be subject to grants of options to an individual in a calendar year | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in shares) |  | 3,561,000 | 3,561,000 | 3,870,000 | 3,086,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 1,728,000 | 300,000 | 947,000 |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 300,000 | 900,000
Exercised (in shares) |  | (1,000,000) | (48,000) | (445,000) | (163,000) |  |  |  |  |  |  |  |  | (45,000) |  |  |  |  |
Forfeited (in shares) |  |  | (400,000) | (128,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expired (in shares) |  |  |  | (36,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end of the period (in shares) |  |  | 4,841,000 | 3,561,000 | 3,870,000 | 3,086,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in shares) |  |  | 2,795,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Exercise Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the period (in dollars per share) |  | $ 3.47 | $ 3.47 | $ 3.24 | $ 2.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  |  | $ 2.26 | $ 5.80 | $ 7.10 |  |  |  |  |  |  |  |  |  |  |  | $ 2.26 | $ 5.80 | $ 7.10
Exercised (in dollars per share) |  |  | $ 1.97 | $ 1.84 | $ 2.52 |  |  |  |  |  |  |  |  | 1.80 |  |  |  |  |
Forfeited (in dollars per share) |  |  | $ 4.57 | $ 6.27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expired (in dollars per share) |  |  |  | $ 7.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at the end of the period (in dollars per share) |  |  | $ 2.96 | $ 3.47 | $ 3.24 | $ 2.02 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable (in dollars per share) |  |  | $ 2.83 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Remaining Contractual Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  | 5 years 2 months 12 days | 6 years 7 months 6 days | 7 years 3 months 18 days | 7 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period |  |  | 5 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercised (in dollars) |  |  | $ 47,000 | $ 596,000 | $ 864,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars) |  |  | 1,190,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercisable at the end of the period (in dollars) |  |  | 1,190,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted (in shares) |  |  | 1,728,000 | 300,000 | 947,000 |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 | 300,000 | 900,000
Exercise price of options granted (in dollars per share) |  |  | $ 2.26 | $ 5.80 | $ 7.10 |  |  |  |  |  |  |  |  |  |  |  | $ 2.26 | $ 5.80 | $ 7.10
Vesting period of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Exercise period of options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 10 years | 10 years
Principal assumptions used in applying the Black-Scholes option pricing model for the awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  |  | 0.97% |  |  |  |  |  | 0.50% | 1.74% | 0.86% | 2.33% |  |  |  |  |  |
Volatility factor of the expected market price of common stock (as a percent) |  |  |  | 75.00% |  |  |  |  |  | 66.00% | 90.00% | 69.00% | 100.00% |  |  |  |  |  |
Weighted-average expected life of option |  |  | 3 years 6 months | 6 years | 6 years 7 months 6 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 1.02 | $ 3.80 | $ 4.86 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option expense |  |  | 1,400,000 | 3,400,000 | 2,700,000 |  |  |  |  |  |  |  |  |  | 200,000 | 1,300,000 |  |  |
Additional disclosures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense on non-vested stock options (in dollars) |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested stock options outstanding (in shares) |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average period of recognition |  |  | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section D -Subsection 2 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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