Tungsten is a metallic element that occurs in nature only as a constituent of certain minerals; it is never found in free or metallic form. USES The chief use of tungsten is in the production of alloy steels. In this field the most important single use is as a component of high-speed tool steels. Other important uses for tungsten steels are in the manufacture of drills, dies, valves, taps, and permanent magnets. A substantial proportion of the total consumption of tungsten is in the form of metallic tungsten used in the manufacture of electric light filaments. Minor quantities of tungsten are used for stellite, a nonferrous alloy, and for dyes, ceramics, fireproof cloth, fabrics, and X-ray screens. The principal tungsten minerals found in Arizona are the wolframites (ferberite, wolframite, and huebnerite); scheelite; powellite; cuprotungstite; and tungstite. Only the wolframites and scheelite have been of commercial importance. 54 p.

This bulletin presents a list and index of the literature pertaining to the geology and mineral resources of Arizona. Most of its citations for the years prior to 1937 were compiled from the bibliographies of North American geology published as Bulletins 127, 746, 747, 823, 834, 858, 869, and 892 of the U.S. Geological Survey. In addition, numerous serials have been examined. Important data were obtained from Olaf P. Jenkins and the late F. L. Ransome. Robert E. Heineman listed the University of Arizona theses. Although this bibliography is intended to cover all of the literature, regardless of the merits of the various articles, many references have doubtless been overlooked. It is hoped that omissions will be brought to the attention of the Bureau. 164 p.

The principal ore deposits of Arizona are in the southern, central, and western portions of the state, which physiographically are part of the Basin and Range province, southwest of the Colorado Plateau (PI. I). The Basin and Range province is characterized by numerous subparallel mountain ranges separated by plains or valleys. Most of these ranges trend northwest to north, parallel to the margin of the Colorado Plateau; but in southeastern Arizona, southern New Mexico, and northeastern Sonora, they trend northward, transverse to the edge of the Plateau. The mountains rise abruptly from plains or valleys, the margins of which in many places are pediments cut on hard rock. Some of the plains form closed basins (bolsons, playas), but most of them are drained. The Basin and Range province in Arizona is divisible into the Mountain Region and the Desert Region- (PIs. I and II). The Mountain Region forms a belt 60 to 100 miles wide that contains most of the large ore deposits. Its longest range measures about 55 miles, the widest 20 miles, and the highest peak more than 10,000 feet above sea level or 7,000 feet above adjacent valleys or plains. Broad plain-forming valleys are exceptional, but several with maximum widths of 20 to more than 30 miles appear in the southeastern portion. 136 p.

Map showing the distribution of major mines operating in Arizona in 2011. As noted in the legend, some mining properties are in development stage.

Requests for information about the metal production of Arizona are continually being received by the Arizona Bureau of Mines. It is in answer to this insistent demand that the data contained in this bulletin have been compiled. The assembled data and information are as comprehensive as it is possible to make them. The total metal production of Arizona has been subdivided and segregated in numerous ways. A start is made by showing the annual production, since 1858,of each of the major metals in pounds or ounces and also in dollars. Each of these metals is then segregated into the kind of ore from which it has been produced, as far back as the records are available. The content in pounds or ounces and in dollars for each kind of ore is also given. The entire production of the state is then allocated to the different counties in pounds or ounces and dollars. The county figures are annual from 1900 to 1934 and combined for the period prior to 1900. To as far back as the information is available, the production of mining districts in each county is given. The mining district production is then shown by mines. In other tables the annual production since 1907 has been shown by methods of recovery. Tables also show the kinds of mines and the operating milling plants and other data relating to ore production. 112 p.

lntroduction:-The copper industry in the United States has enjoyed a year of unparalleled prosperity during 1915. It is needless to explain the conditions which have so greatly affected our copper market, as they are really self-evident, but I shall endeavor here to outline the possible conditions of the future copper market, which would be created by the termination of the European war. The opinions regarding this question are many and greatly diversified, and many hold the belief that the termination of the war will result in a decline of the copper prices to a very low level. However, the consideration of the following facts will be of help in the formation of a more or less definite conception as to what the effect of the cessation of war might be upon the copper market. 14 p.

The first publication of the Arizona Bureau of Mines on Arizona Gold Placers was written by Mr. M. A. Allen, when Geologist with the Bureau, and appeared in 1922 as Bulletin 118. It was mainly a compilation of data already in print, but scattered and difficult to find. The stock of this bulletin was exhausted in four years. Mr. Eldred D. Wilson, Geologist with the Bureau, was then commissioned to re-write the bulletin, adding what new data could be obtained. Assisted by Mr. W. R. Hoffman in the field and further aided by the advice and suggestions of Dr. Carl Lausen, then Geologist with the Bureau, Mr. Wilson completed his work in the summer of 1927 and a large edition was published at once as Bulletin 124. Conditions with which everyone is familiar developed within two or three years and so much interest was shown in gold that the demand for this bulletin was extremely heavy and the supply was exhausted before June of last year. A new and greatly enlarged bulletin, No. 132, was prepared at that time, and, although five thousand copies were printed, they have all been distributed. The present bulletin does not differ radically from No. 132, but many parts of that bulletin have been re-written and an attempt has been made to bring the information obtained therein up to date. Mr. Eldred D. Wilson made the field investigations required to secure this new data, and at least a dozen additional districts are described in the present bulletin. 148 p.

The first publication of the Arizona Bureau of Mines on Arizona Gold Placers was written by Mr. M. A. Allen, then geologist with the Bureau, and appeared in 1922 as Bulletin 118. It was mainly a compilation of data already in print, but scattered and difficult to find. It proved to be popular, and all copies printed were distributed in four years. Mr. E. D. Wilson was then commissioned to rewrite the bulletin, completely, adding what new data could be obtained. Assisted by Mr. W. R. Hoffman in the field, and further aided by the advice and suggestions of Dr. Carl Lausen, then geologist with the Bureau, Mr. Wilson completed his work in the summer of 1927, and a large edition was published at once as Bulletin 124. Conditions with which everyone is familiar have aroused so much interest in gold that the demand for Bulletin 124 has been extremely heavy, and the supply was exhausted before June first of this year. This new bulletin has been prepared to meet the demand for information on Arizona gold placers which shows no sign of abating. 114 p.

When the first report on the Mineral Industries of Arizona was published in 1928 as Bulletin 125, it was planned to issue such a report annually, but the Bureau found itself financially unable to carry out this idea last year, and it seems probable that a biennial review of the mineral industries of the State will serve the needs of inquirers fairly well. It is, therefore. planned to publish in the future such reports every two years. This second report is not intended to displace Bulletin 125, but, rather, to supplement and bring up to date the information presented in the first report. Persons interested in Arizona's mineral industries should possess both bulletins. Mr. Tenney's introduction to the section on copper mining and the data relating to the number of men employed by the copper companies were prepared prior to the decline in the price of copper, and it would be necessary to modify these statements considerably to make them applicable to the present situation. Since the prevailing curtailment is considered abnormal, it has been thought best not to attempt to give figures applicable to the industry at the time this bulletin goes to press. This report, then, covers the condition of the copper mining industry just prior to the curtailment of operations mentioned. 108 p.

Manganese does not occur as a native metal, but is found in nature in a great variety of combinations with other elements, whereby it forms a part of more than 100 minerals. Practically all of the manganese of commerce, however, is obtained from one or more of the first seven of the following minerals: Psilomelane, Rhodochrosite, Pyrolusite, Bementite, Manganite, Rhodonite, Wad, Hausmannite, Braunite, and Alabandite. 104 p.