Mohave County miner and our mineral wealth., 1922-03-31
INCREASED GOLD VALUES AT DEPTH
 SHOWN IN THE KATHERINE SECTION
By William P. De Wolf.

Mine work at increasing depth Tn the Katherine district is marked by an increase of gold values in the ore bodies, and is forcefully demonstrated that the veins have deep-seated origin and are both wide and well miner alized. In the Katherine mine, to ll- lustrate, the vein is wider and strong CT and richer at depth of 600 feet than on the levels above, and is stand ing true and well defined between porphyritic- granite walls. Two miles to the north of the Katherine mine, the Gold Chain vein, where cut in the Gold Chain shaft at depth of 16O feet. is richer than where exposed on the 1OO-foot level, while the silic- ious rhyolite foot-wall at depth of 205 feet "pans" gold freely and shows considerable white iron. In the near by Adams mine the ore opened east of the shaft on the 20O-foot level is both richer and wider than where ex- posed on the 100-foot level.
 With the completion Of the station at a depth of 200 feet in the Gold Chain shaft, matter of few days only, a crosscut will be run north to and through the vein which shows width of 46 feet on the 100-foot level. Sinking will then be resumed with depth of 300 feet as the objective. This work will serve to further test ha rrol,l x,ol,,ac ,n fha ,.h,,olffn fnn-- wall, and will be followed by exten- sive lateral development in the vein and footwall on the proposed 300 foot level. This will check the very sat isfactory results obtained by cross cutting ana drifting in the Gold Chain vein on the l0O-foot level and will determine the initial capacity of the ore reduction plant the management Ill construct rear the shaft.
 It is announced from headquarters of the company in San Francisco that the recent death there of MT. E. s. Shanklin, a director of the company, will not in any way affect the man. agerial policy as now in force. The advice Of MT. Shanklin in th', carry ing out of development plans will, however, be greatly missed as he was a mining engineer of large practical experience and we'll establishd repu- tation. He had mined extensively in the United States and Mexico and stood high in his profession.
 Crosscuts and drifts are being run in the ore on the second winze level in the Katherine mine, and at the same time the winze is being sunk an additional 100 feet, which, will give it total depth of 300 feet below the 400-foot level of the main workings and give the mine a total depth of 700 feet. Level by level, as. the Katherine shaft was deepened, there was a marked increase of gold values, but at no point was the increase so pronounced as on the recently estab- lished second winze, or 6O0-foot level. There the ore is said to have a value as high as SPA gold ton across a width of 12 feet. On the first winze level the gold value for width of IF feet is placed as high as $1S3 a ton. Development of the Adams vein to the east of the shaft on the 200-foot level has been resumed with the re- pairing of the hoisting machinery. As the heading is advanced the ore con- tinues to "pan" across a width of 5 feet and to show considerable free gold. The geologic conditions are similar to those in the bottom of the Gold Chain shaft, where, as stated be- fore, the rhyolite footwall "pans" we'll and offers the probability that the silicified rhyolites of the Rather inc district are as highly gold-enriched as are those of the nearby Oatman district.
 At the Big Four property, where the development campaign is in charge of w. w. Wishon a successful and widely known mining engineer, the shaft is nearing a depth of 100 feet and is in oxidized dyke material which shows considerable calcitic-quartz The objective of the shaft is a depth of 300 feet, where the immense dike with its half-dozen veins is to be crosscut and drifted on.
 Everything is in readiness at the Treasure Vault property for the ar rival and setting of the machinery Shaft work will follow it's erection with view to extensive development of the Treasure Vault vein at deptl of 300 feet. Diamond drills will prob ably be used for prospecting purpose on the 30O-foot level. At a depth O 56 feet in the shaft the vein is strong ly mineralized and presents indica tions of making large deposit of pa
 ore at greater depth.