Bisbee daily review., 1905-01-03
G0LOFIELD CAMP REVIEWED BY
 U. s. SURVEY
GOLOFiELD CAMP REVIEWED BY GEOLOGICAL SUR
 NEY.
Formation of the District Described By An Espert-Fourteen Tons of Gre Yielded $45,7S3.

Gre Yielded s45,7ss.
 The new camp of Goldfeld, in Ne rada. which was first known as the Grandpa district, gives promise of be. coming a very important mining cen ter. The district, which was located tate in the spring of 1903. lies about axeuty-three and one-half miles south of Touapah. J. F.. Spur. of the Unit ed States Geological survey, visited it io- the second time in November. l9oi and was interested to note the H-ay irf which jt has developed since his first visit, which was made soon after the discovery of gold in the dis tric; A little work was then in pro sress on what is now known as Colum- ois Mountain. but up to that time 10 good strikes had been made. In Jaaua.y and February. 1904. however rich ore was struck in certain spO,s south of Columbia mountain The town of Goldfelds has sprung up since shen and a number of smaller adjacent camps have been established. so that she district has an approximate pop nlation of 60Q0 IL is estimated that up 10 the present time aboJt two mil fion dollars worth of ore has been shipped from the district Mos, of these shipments have been made in she last five months.
 On the last visit Mir Suprr took no es ove- an extended area anC made interesting additions to h.s knowledge of the geology of the district. Since last year the area Of known ore bod sss has spread so far beyond Colhlnbia Mountain tsat values are now found over CisItict about six miles square. The chiey mines at the present time are the Jumbo. the Combination. the January. and the Florence. all grouped ,46gether about a mile south Of the z southeast end of Columbia Mountain About five miles southeast of Columbia Mountain in the Diamon fields group which includes the VerEal, the Quar.z ste. and the Black Butte, from which shipments have also been made other ore deposits have been develop sNi in various parts of the field.
 The rocks in that part of the field visited by MT. Spur on his last triI 9the region of Columbia Mountain D.amondfields. and the Jumbo groul
 
 entirely volcanic consisting of rhyo ares. rhyolite tufts, andesites. anf 6asalrs, all probably of Tertiary age The ores occur in both rhyolites aaC andesites No definite veins or sys ssniS were observed. The outcrops . shy, quartz bodies are irregular. strag .=iing branching and ap- to disappear suddenly. They are sometimes nearr circular or cTescentic, and frequent, are roughly lenticular and intermit fsnt Owing to the silification of th rolcanic rock in which it occurs. ih suartz itself is gray and jaspery It i probable that this silifcation is tn SorlZ of hot springs and that these i' regular reefs represent the horizontC sections of columns of rocks tayerse 8y rising columns of hot water. Ha che rocks been strongly fractured " should have had veins like those of tn early andesite a. Toropah, but th ssck of such a fracture system d eSoIdhelds resulted in the curious an rather unusual type of deposit fellows that the quartz reefs will prol zhly extend deeper vertically tha aorzoutally, and so have roughly th zssure Of columns Or pipes.
 The greater part of these jasper suartz reefs contains no gold Withi some of them. however pIospectol hare discovered irregular portion That carried gold in paying quantFie r seems probable that these sE9o are the real ore deposits. and tn TAe mass of reefs constitutes mer N q siliceous jacket or casing. sue As is known fo surround ere bOdiF aa some parts of the world. TT pay shoots would seem to repreSel slss main channels of hot water circ e.tion. while the siIiceOus casings al s7se result of the water soaking thToug she adjacent rock.
 The ores are often of very hie grade. As an extreme example ma Be noted a shipment of 14 1-4 tor @oo the Sandstorm. which yielda Ss5.7o3 net when worked in a stsm saiTE. while the tailings still containe ssSoHJ 5000 to the ton. From th HrcKane-Bowes lease on the Jumb sss0. 900 was taken out in fv months from a space that measure lfoS feet horizontally and 200 feet vert ezIfy on the shoot The whole pr; S~efion of the camp has come froi ores that range in value from s200 ' $500 ton. TEc values are all sold as silver is rratically absent k exception to this rule is found in tn ere of tt...- Coordination mine, whic es1tairr from one to three ounces c sssfver to inc ton.
 Most of the ere extracted has bee ssxidszed ore As the water level a teale fields is unusually high for thi