Mohave County miner and our mineral wealth., 1921-05-13
DEPTH DEVELOPMENT
 OF DIAMOND JOE NOW BEING PLANNED

A campaign of development work at depth is soon to be started at the Diamond Joe mine, one of the old-time bonanzas of the Wallapai range. Plans to that end are now being drawn by General Manager E. c. Bradshaw, and include in their scope the open- ing of ore in the primary zone, recent ly entered ,and the equipping of the mill with the units essential for it's successful reduction. The decision to develop the mine at depth is the di- rect outcome of strike recently made in the winze below the 4OO-foot level, where the miners are working in four feet of sulphide ore that as- says $36 silver and $S gold a ton. Associated with the ore, which there, as above, is porphyry intrusion in the granite, are gray copper and steel galena. The change from an oxidized to sulphide ore is very pronounced in the winze and is becoming more so as it is deepened.
 Development of the property to date has been done by means of a tunnel that has been driven on the vein for distance of 600 feet. Above the tunnel level there are approxi- mately 250 feet of backs, or stoping ground. On and above the tunnel level the ore is a silver-chloride hav- ing an average width of 10 feet and an average value of $16.36 a ton. There are lenzes in the vein, however, which assay as high as $500 a ton, and three feet of the ore, as broken for the mill, assays as high as SIP ton. The assured ore on this level approximates 4500 tons. The stope fills above carry $500 tons of ore. All of this ore has an average value of $16.35 ton.
 On the tunnel level a winze was sunk to depth of 180 feet. A level was run at a depth of 80 feet and opened 5000 tons of ore that has a value of $16.50 ton. From the bot tom of the winze another level was run along the strike of the vein for a distance of 180 feet. The ore opened therein, from the winze station to the drift heading, has a value of nearly $20 a ton. It carries both chlorides and bromides, and, at times, native silver. Wherever the latter makes in, the value of the ore increases to around $100 ton. Picked specimens of the native silver ore often yield sensational values.
 Twenty-Five feet from the winze station the lower level entered sul- phide ore and winze was sunk to de- termine the permanency of the depos- it. From collar to bottom--a present depth of 60 feet-the winze is in the sulphides, under mineralogical condi- tions which indicate that the zone of primary precious-metal enrichment is being entered. Evidence in support of this assumption is offered by the fact that with the appearance of the sulpmdes in the ore the chlorides are disappearing. As the sulphide con- tent increases there is also a gradual increase of gold values. In the upper levels, for instance, the ore carries gold values of 80 cents a ton only, whereas in the bottom of the winze the gold values are about $8 a ton. The silver, too, increases from an av- craze high of $16.5O on the upper levels to high of $36 in the bottom of the winze.
 The satisfactory ore conditions in the Diamond Joe mine are due to the development work done during the past twelve months by the Silver Trail Mines Company, controlled ty E. c. Bradshaw and associates. Prior thereto the property was worked at intervals by leasers and others, who robbed the vein of it's high grade sil- yer chlorides and bromides and drop ped the lower grade reject into the stopes as filling. In the aggregate ,hese so called "highgraders", or chlo- riders", shipped about $50O,OO0 worth or ore. The ore was sorted into two grades, one carrying 300 ounces sil- yer and the other 180 ounces silver ;on, and was freighted 20 miles to Yucca-the nearest railway point.
 Bradshaw and his associates, since hey took over the Diamond Joe mine about year ago, have expended near y $100,O00 for mine development, mine and mill machinery, property and other essentials. The act that thus far they have not asked or financial aid and have drawn on heir own resources for this substan- ial fund demonstrates their faith in he future of the mine. To date they lave done $500 feet of tunnel, drift, tope and winze work-all in ore. At his time they have, including the