The Arizona sentinel., 1907-09-04
New Mining District in
 Yuma County
Many PrOspeCtOrS Are Now Going Into the HaTCuydr Mount
 ain Section,

Of the many new mining districts which have rapidly come to the front l of late. the Harcuvar Mountain section in northern Yuma county is notable example. Until quite recently this dis trict has been almost inaccessible, hav- ing been located 60 miles from a rail road and in desert section which made it impracticable to prospect or develop anything but the highest grade proper ties. The building of the Arizona & California railroad from Wickenburg i to Parker. on the Colorado river, has made great change and many outside of mining men have come into this sec tion during the past eight months to locate or purchase some of the numer- ous properties which can now he de- veloped and worked with handsome profits. X number of individual opera tors and companies are now taking out ore and several have been shipping all the summer despite the hot weather On account of the many fine showings made late in the spring there has been no shut down this summer, as is usual | in many of the desert camps in Ari- zona.
 The new district is located from s to | l2 miles from Salome on the Arizona & California railroad, and can be reached | from there or from Wenden, a neigh boring town, both of which are grow | ing rapidly.
 The main Harcuvar range is similar to many of the desert mountains, being a coarse-grained granite core forced up through the desert and isolated from the surrounding ranges by broad val 1 leys covered with greasewOod and cac- tus. The Harcuvar range is about B miles long and flanked on the northerly side by up tilted and alternating layers of schist and lime reefs, the lime and schists approximating several thousand feet in thickness where most exposed. Tho range has not been thoroughly prospected as yet, but the principal mineralized portion now seems to be a belt about F miles long, due north of Salome between Cunningham pass and Tank pass. In this section the main granite range is crOsscnt by a very uni form system of dark colOred igneous dikes, blue andesite, diaAase and dio- rite, running northwesterly and south easterly and standing nearly vertical, in size ranging from a few inches to nearly 209 feet in thickness and some of them being continuous for six or seven miles in length. There are also numerous rhyolite dikes with a more easterly trend, but, as far as developed, these seem to bear no apparent relation to the ore bodies, as of the 200 or more claims located and now being develop ed nearly all are in close proximity to the dark colored dikes, either on the contact with the grani'e or in between two parallel dikes. Associated with or in between the dikes there is nearly always more or less decomposed gran ite, locally knowm as white pprphyry and is generally in this white porphyry that the ore bodies occur. The veins are nearly always barren or very small on the surface, in some cases there being a few inches of hematite, fimon ite or copper stained iron accompany ing the dilzes on the surface, and where TO iron is visible the usual indications of ore is a yellowish red iron stain ir Che vein filling near the dikes. While not showing or the surface the ore is generally developed at 8 depth of from ten to thirty feet, being high grade copper gold ore, rearly always sul phde and shipped without sorting averaging from F to 40 per cent cop per and from SlO to $I25 in gold, the gold values generally increasing in pro portion to the amount of copper. The pay streaks are generally uniform in size, averaging on different proper ties as now developed from eight inche: to three and 6 half feet. In most case! the ore has increased, both in size anc values with depth, notably in the Vic tor &5 Belle Grown which started witl few inches of copper stained iron ant now has at depth of I60 feet about 3t inches of high grade ore averaging over $l25 in copper and gold. Yer! little oxide ore has been developed upon any of the Harcuvar properties the ores generally being chaleocite bornite and chalcopyrites with accom-
 panying gold values.