RE: ? UndervaluedCopperstone
The Copperstone property is located in La Paz County, Arizona, approximately 9.5 miles north of the town of Quartzsite. The property consists of 335 unpatented mining claims and two state mineral sections covering an area of approximately 8,821 acres that is controlled by the Patch Living Trust.
American Bonanza holds a 100% leasehold interest that has a 10-year term starting June 12, 2005, and is renewable by American Bonanza for one or more additional 10-year terms.
The property is a 'brown field' site previously operated by Cyprus Minerals Co (Freeport) that has a reclaimed open pit, waste storage facilities, tailings storage, and loaded heap leach pad. Cyprus Minerals produced approximately 500,000 oz Au from 1987 to 1993, when the pit reached its economic limits. [Source: NI43-101 Report February 2010]
Latest NI43-101 Report: NI 43-101 Technical Feasibility Report, Copperstone Project, La Paz County, Arizona.
2010-02-02 (227 pages).
Project Location: Arizona, USA.
Measured + Indicated
| Metal | MVpSh | Contained Metal Quantity | Ore Grade | Ore Quantity |
| Gold | $5.06 | 531.69 K oz | 5.314 g/t | 3.11 M t |
Estimate notes: See Table 1-1 on p. 14 of 227 in the NI43-101 report dated February 2010.
Capped at 5.0 oz Au/t with a 0.05 oz Au/t cut-off grade.
Inferred
| Metal | MVpSh | Contained Metal Quantity | Ore Grade | Ore Quantity |
| Gold | $2.53 | 266.05 K oz | 4.697 g/t | 1.76 M t |
Estimate notes: See Measured + Indicated note.