Bisbee daily review., 1907-09-08
|S NEW DISTRICT FOR
 MINING
Northern Yuma County Is Be- ing Invaded by Large Num- Der of PrOSpeCtorS Who See Great Promise of Future,

Of the maky new mining districts
 which have rapidly come to the front
 of late, the Harcuvar Mountain sec tiOn in northern Yuma county is a notable example. Until quite recent i iy this district has been almost in | accessible. having been located SO miles from railroad and in a desert 1 section which made it impractical bIe | to prospect or develop anything but
 the highest grade properties. The l building of the Arizona & California railroad from Wickenburg to Parker | on the Colorado river has made q I great change and many outside mining men have come into this sec tion during the past eight months to locate or purchase some of the num- erous properties which can now be de- velOped and worked with handsome profits. number of individual oper- ators and companies are now taking out ore and several have been ship ping 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 Arizona.
 The new district is located from
 B to F miles from SaIEme on the
 Arizona X California railroad, and
 can be reached from there or from
 Wenden, a neighbOring town, both of
 which are growing rapidly.
 The main Harcuvar range is simi-
 lar to many of the desert mountains
 being a coarse-grained granite core
 forced up through the desert and iso-
 lated from the surrounding ranges by
 broad valleys covered win grease
 wood and cactus. The HarCuvar range
 is about B miles long and flankeq on the nOrtheTly side by up tilted and alternating layers of schist and lime reefs. the lime and schists approxi- l mating probably several thousand feet in thickness where most exposed. The range has not been thoroughly pros pected as yet, but the principal min | eTalized position now seems to be a | belt about 12 miles long. due north | Of SalOme between Cunningham pass 1 and Tank pass. In this section the | main granite range is crOsscut by a | very uniform system of dark cOlOred l igneOus dikes, blue andesite. diabase | and diOrite, running nOrthwesterIy | and sOutheasteTly and standing near ly vertical, in size ranging from a few 2 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 ap- parent relation to the ore bodies as of the 200 or more claims located and now being developed, nearly all are in close proximity to the dark colored dikes, either on the contact with the granite or in between two parallel dikes. Associated with or in between the dikes there is nearly al ways more Or less decOmpOsed gran te, locally known as white porphyry and il is generally in this white DOT 1hyry that the ore bodies occur. The l veins are nearly always barren or fery small on the surface, in some ;ases there being a few inches of he natite, limonite or copper stained ron accompanying. the dikes on the surface. and where no iron is visible he usual indications of ore is a vel l owish red stain in the vein filling lear the dikes. While not showing 'n the surface the ore is generally leveloDed at a depth of from 10 feet ! o 30 feet, being high grade copper sOld ore, nearly always sulphide and l hipped without sorting, averaging rom 12 to 40 per cent copper and 1 rom s10 to s125 in gold, the gold T -aiues generally increasing in propor- I ion to the amount of copper The I 'ay streaks are generally uniform in I ize. averaging on different properties I IS now developed from s inches to C
 l-2 feet In most cases the ore has increased, both in size and values with epth, notably in the Victor & Belle 2 ,rown which started with a few inch { S of copper-stained iron and now has | t depth of 160 feet about 30 inches r f high grade ore averaging over S125 e D copper and gold. Very little oxide 0 re has been developed upon any of a be HaTcuvar properties, the ores v enerally being chalcocite, bornite and ! with accompanying gold = alues.