Exhibit 99.4
AMENDED AND RESTATED JOINT FILING AGREEMENT
Pursuant to this Amended and Restated Joint Filing Agreement, the undersigned acknowledge and agree that the foregoing Schedule 13D, as amended, is filed on behalf of each of the undersigned and that all subsequent amendments to this Statement on Schedule 13D may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. This Amended and Restated Joint Filing Agreement replaces in its entirety the Joint Filing Agreement, dated January 7, 2010, filed as Exhibit 99.1 to the Schedule 13D filed on January 7, 2010 by the parties thereto.
Dated: February 2, 2010
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TONGLING NONFERROUS
METALS GROUP HOLDINGS CO., LTD.
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| | By: | /s/ Dongqing LI | |
| | | Name: | Dongqing LI | |
| | | Title: | Chief Engineer | |
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CHINA RAILWAY CONSTRUCTION
CORPORATION LIMITED
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| | By: | /s/ Zhiliang ZHOU | |
| | | Name: | Zhiliang ZHOU | |
| | | Title: | Company Vice President | |
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CRCC-TONGGUAN
INVESTMENT CO., LTD.
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| | By: | /s/ Shouhua JIN | |
| | | Name: | Shouhua JIN | |
| | | Title: | Director | |
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CRCC-TONGGUAN
INVESTMENT (CANADA) CO., LTD.
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| | By: | /s/ Shouhua JIN | |
| | | Name: | Shouhua JIN | |
| | | Title: | Chairman | |
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