Mineralization at Mt. Hamilton consists of skarn hosted tungsten, molybdenum, and copper +/- zinc with later epithermal gold and silver. Gold mineralization is primarily hosted in a 200 to 300 ft thick skarn horizon, bounded by upper (200 ft thick) and lower (450 ft thick) hornfels units. The bounding hornfels had lower permeability and were therefore less receptive to late-stage mineralization. The interbedded skarn in the Centennial area was subject to late-stage, low-angle faulting. These faults were conduits to late mineralizing solutions and oxidation. The result is an oxide-hosted epithermal gold deposit overprinting a retrograde polymetallic skarn. The main Centennial precious metal mineralization is contained within a southeast dipping (15° to 20°) tabular zone that ranges from 20 to 250 ft in thickness. In the NE Seligman area, ore grade mineralization appears to be largely stratiform in shallow-dipping, bedding-parallel, structurally and chemically prepared zones with local high-angle, cross-cutting, possible "feeder" zones (Burgoyne, 1993). At Centennial, the mineralization is controlled by late low-angle structures that are discordant to bedding and oxidized to significant depth. Gold grades of samples within the retrograde alteration range from <0.001 oz/t Au (lower analytical method detection limit) to 0.995 oz/t. The occasional high grades appear to be associated with crosscutting structures and veins within the skarn as described below.

In the Cente ........

Oxide mineralization at Mt. Hamilton is close to the surface and the resource lends itself to an open pit mining method. The mine design consists of two main pits with the approximate dimensions of 1,900 ft wide by 2,600 ft long by 800 ft deep; with a volume of 36 Myd3. The pit designs were segregated into at least three phases each for production scheduling with 90 ft wide ramps (including berm) at a maximum in-pit road grade of 10%. Mining operations at Mt. Hamilton have a stripping ratio 2.5:1, waste to ore, with mining taking place on the side of a hill at an approximate elevation of 9,000 ft amsl. Ore will be hauled from the pits to a primary crusher located on the southwest rim of the Centennial pit or stockpiled near the crusher for later use. Waste rock will be placed as valley fill in Cabin Gulch, a centrally located valley between Centennial and Seligman. The final waste rock storage facility will be regraded to 2.5 H/1V per State of Nevada regulations for reclamation.

The mine life is estimated to be seven years with an additional nine months of pit pre-stripping. The life-of-Mine (LoM) average mining rate is estimated at 3.5 Mt/y ore (10,000 t/d) and approximately 8.5 Mt/y waste.

Open pit mining will be by conventional diesel powered equipment, utilizing a combination of blasthole drills, hydraulic shovel, rubber-tired wheel loaders and off-highway 100 t trucks. Support equipment composed of graders, track dozers, and a water truck will aid i ........

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