Arizona republican., 1905-12-09
GEOLOGICAL REPORT
 ON BRADSHAW REGION
Synopsis of the Survey of the Quad.
 ranele.

rangle which has been mapped by ty- pographers and geologists of the United States Geological Survey. A folio descriptive of this quadrangle has recently been prepared by Messrs. J. A. Jaggar, Jr., and Charles Palache, geologists of the survey. It includes one typographical map of the quad rangle, one map illustrating the areal geology and one illustrating the econ- omic geology, a page of structure sec tions, and a page of exceptionally fine photographic views
 The quadrangle is in the southeastern part of Yavapai county, Ariz., and in- cludes a very small part of Maricopa county in its extreme southwest cor ner. A portion of the Prescott forest reserve occupies the western half-a mountainous region including all the higher summits of the Bradshaw range. The city of Prescott is two miles north of the northwest corner of the quadrangle, and Jerome, a min ing town is seventeen miles north of the northeast corner. The only settle ment in the quadrangle at the time of the survey were small mining camps and scattered ranches. On the north the Prescott and Eastern railroad en- ters the quadrangle near Valverde smelter and terminates at Mayer sta tion. The eastern third of the quad rangle consists largely of low lying desert land and basaltic mesas.
 That part of the folio in which the mineral resources of the quadrangle are discussed will be of most general interest. They include gold, silver, copper and iron-ore deposits, building and ornamental stones, and undevelop ed bodies of valcanic ash.
 No definite statement of the out put of the precious metals from this region is possible, but an estimate based on scattered contemporary sta tistics and on the mint report gives an approximate value of $9, 300, ,000, about equally divided between gold and silver. At the time of the survey Q90D only two or three large mines were actually producing, and the out put of the district, chiefly gold, was probably less than $20O,O0O. A num- be~ of other mines, recently active and of demonstrated value, were closed down by reason of litigation or other adverse circumstances.
 The ore deposits of the quadrangle with few exceptions, are Assure veins 
 be classified, according to the dom inant values of their contents. into gold, silver and copper, deposits, and have been so indicated on the map in most cases, but the distinction be- tween the classes is not sharp, since all these metals commonly occur to- gether, and their relative amounts may vary widely in different portions of a single deposit.
 The important mines in the quad rangle are in it's northern and west ern parts, and occur in groups acco- ciated in striking manner with the four intrusive stocks of quartz -diorite which occupy the basins of Groom and Hassayampa creeks, of Lynx creek, of Bigbug creek and it's branches near McCabe. and of Poland creek near Crown King. Brief descriptions of the veins in these four areas and of the less important out lying veins are given.
 Rich placer deposits formerly existed along most of the streams of the quadrangle, and it is estimated that not less than a million dollars were obtained by placer mining up to 1881. At the present time the river placers are almost exhausted.
 No iron ores of proved value are known in the quadrangle. Iron ores of possible values, were. however, noted at one point. On the ridge at the head of Blind Indian creek, about two miles southwest of Bueno, in a body of schist rich in magnetic. It may be of very local development, but examination of the whole ridge indi- cates more or less ferruginous schist for upward of two miles north and south of the locality in which the richest specimens were found.
 The only stone quarried in the quad rangle for building purposes is the green rhyolite turf found abundantly in the valley of Castle creek.
 The stone was said to be soft and easily worked when quarried; it hard ems on exposure and presents a hand some appearance.
 Near Mayer, on the left bank of Big bug creek, is a considerable deposit of onyx marble, small portions of which are of a quality that renders it suita- ble for decorative stone. The onyx is extremely variable in color and tex ture It is generally white or pale green when fresh, but weathering his produced variations of color, which give it the most of its decorative value.
 The only permanent stream in the quadrangle is the Agua Fria river, which throughout the year contains moderate amount of water. In the southern half of the quadrangle des- ert conditions prevail and water is to be had only at widely scattered points, chiefly from wells. Beyond the small areas of alluvium along the streams, the soils of the quadrangle are sparse and poor.
 The folio which is No. 126 of the series, is for sale at 25 cents a copy. Application should be made to the di- rector of the United States Geological Survey, Washington, D. c.