The Moonlight Copper project, which is located in Plumas County, California 167 km (104 mi) northwest of Reno, Nevada, contains two advanced stage copper targets - the Engels and the Superior mines.
The Engels mine, which is located entirely on patented mining claims in the Lights Creek District, was an important historical producer of high grade copper ore. Known copper mineralization is controlled by a poorly defined northeast trending, steeply dipping structural zone cutting an equigranular - porphyritic diorite. As shown by the recently completed drilling program, the mineralogy of the copper mineralization within this structural zone is quite complex. Copper oxide mineralization, which is locally high grade (several percent total copper), occurs mainly in iron oxides or as neotocite, tenorite, chrsyocolla and copper clays. Locally below the copper oxide mineralization, there is a high-grade mixed oxide-sulphide assemblage consisting of the previously mentioned oxide minerals plus minor cuprite mixed with chalcocite, minor covellite, bornite and chalcopyrite. The mixed oxide-sulphide assemblage transitions vertically and laterally into hypogene (sulphide) mineralization consisting of pyrite, chalcopyrite and bornite.
Although the lateral extent of this mineralized structural zone along strike is not known at this time, it is believed to remain open to expansion with additional drilling. Additionally historical selective mining at the Engels to depths in excess of 1,500’ (457 m) indicates that strong copper mineralization continues down dip on the structural zone. This fact is further supported by previous underground core drilling that intersected strong hypogene (sulphide) mineralization below the existing mine workings.
To begin evaluation of this high grade copper target, Starfield Resources completed a preliminary core drilling program in the fall of 2009. This drilling, which consisted of three angle holes totaling 574’ (175 m), was designed to confirm previous high grade copper drill intersections. Click here to view a cross section of drill hole ME09-01 and ME-09-02.
In June 2010, Starfield undertook a second phase of drilling to further evaluate the high grade, structurally controlled copper mineraliztion. The program consisted of four angle holes (ME10-04 to ME10-07) totaling 1,497 feet. Two "step-out" holes returned particularly favorable results. Hole ME10-05 returned 91 feet of 5.09% copper and 68.5 g/t silver, including a 55 foot section of 7.99% copper and 108.6 g/t silver. Hole ME10-04 intersected 84 feet of 2.04% copper and 15.3 g/t silver with a 109 foot section of 1.81% copper and 13.8 g/t silver. Click here to view a cross section of drill holes ME10-04 and ME10-05.