The Kusko times., 1931-12-05

ed careful examination of all acces- sible mines and prospects,; the con- struction of mine maps where none were already available; the detailed study of geologic structure as it af- fects the distribution of, ore bodies; tn edetermination of the mode of oc- currence of metallic minerals in the lodes, with, special attention ito the presence or absence of surface. en- richment; the ;sampling of ore bodies to determine their size and value; :. and the collection of al information that might help in predicting the probable depth to which ore might be expected to extend. These studies required the preparation. of special topographic maps in the Kantishna, Mount Eielson, Girdwood, and An thracite Ridge areas.
 Fairbanks District.
 In the Fairbanks district J. M. Hill has made careful study of all the lode properties to which he could gain access. Four gold lode mines are ac- lively milling ore, and several others are being developed. Although little ore has been blocked out in a tech nical sense, there is good reason. to believe that sufficient ore is available to keep the mills active for several years. No mine in the district has yet reached depth of more than 300 feet, and the question whether the gold ore continues to greater depth has vital bearing on the future of lode mining in this region.4 Although the field evidence in places, suggests that there. may have been some enrich ment of the shallow portions. of the veins, there. salso definite evidence that the values contain primary, gold of economic value that should con stinue to depths considerably below any that have so far been reached, i.s. A matter of great importance to the future of lode mining in the, Fair banks distriit is to determine whether or not rertain large mineralized lodes, such as the Ryan lode. san be mined at a profit. It seems. to be definitely. established that, the Ryan lode lon tains well over 100000 tons of ore larrying between s4 and s5 to the ton in gold. Whether or not this. ore can be profitably extracted is a mining problem that is receiving careful at tention.
 The Fairbanks district as a whole affords large possibilities that that many gold lodes other than those now known amy be discovered. MT. Hill is of the opinion that several properties not now being operated are of sufficient merit to warrant act i've mining, and he believes that with the necessary capital and intelligently directed development the lode gold output of tthe district can be greatly increased.
 Eva Creek Mines.
 At Eva Greek, II miles east of Ferry on the Alaska Railroad, prop erty owned by the Eva Creek Mining Company is now being actively devel-- oped, and 50-ton mill has been phr- chased for installation this fall. The ore body, consisting of base gold ore; lies in schist, and although the re- suits of the Geological Surveys sampling have not been received. it appears probable that there are. re- serves of 25,OOO to 5O,0OO tons of ore carrying more than S2O in gold ta the ton. This ore will have to he connen- trated, and with the mill operasipg at full capacity about four tons. of con- centrates day should, be recovered. This concentrate must then be shipped to a shelter for reduction.