Report issued by the Bureau of Mines over geophysical studies conducted on iron deposits of Grant County, New Mexico. Methods and equipment used during the studies are presented. The results are also presented and discussed. This report includes tables, maps, and illustrations.

This report is on the Hells Gate Roadless Area (3-021), Gila County, Arizona.

From abstract: The ore deposits are in fissue veins that contain silver, nickel, cobalt, and uranium minerals. The ore minerals, which include native silver, argentite, niccolite, millerite, skutterudite, nickel skutterudite, bismuthinite, pitchblende, and sphalerite, are in a carbonate gangue in narrow, persistent veins, most of which trend northeast. Pitchblende has been identified in the Black Hawk and the Alhambra deposits and unidentified radioactive minerals were found at five other localities. The deposits that contain the radioactive minerals constitute a belt 600 to 1,500 feet wide that trends about N. 450 E. and is approximately parallel to the southeastern boundary of the monzonite porphyry stock. All the major ore deposits are in the quartz diorite gneiss close to the monzonite porphyry. The ore deposits are similar to the deposits at Great Bear Lake, Canada, and Joachimsthal, Czechoslovakia.

From introduction: Mining began in the Black Hawk (Bullard Peak) district in 1881 when high-grade silver ore was found at the Alhambra mine. Most of the silver produced was native silver, associated with nickel and cobalt arsenides and sulfides. In 1920 pitchblende was recognized on the dumps of some of the old mines, and since 1949 the district has been of interest as a possible source of ores that contain uranium, nickel, and cobalt.

From abstract: The Merry Widow claim is near the center of sec. 22, T. 20 S., R, 15 W, New Mexico principal meridian, about 1 mile west of White Signal, Grant County, N. Mex. Secondary uranium minerals were discovered in the White Signal district in the early 1920's although several mines in the district had been worked previously for gold, silver, and copper. The writers mapped the Merry Widow claim in 1950, collected 133 samples, and logged the core from one diamond-drill hole on the Merry Widow claim.

From abstract: The Santa Rita mining area (pl. 1), covering 35 square miles of semiarid mountainous land, lies within the Silver City 30-minute quadrangle, Grant County, N. Mex., and includes the most productive part of the Central or Hanover mining district. Ore was produced in this district as early as 1804 and production continued intermittently for a century before the developments were undertaken that led to large-scale copper mining, which began in 1912. The output of zinc, lead, and iron increased markedly about the same time.

Report discussing the U.S. Geological Survey's investigation of known uranium deposits in Grant County, New Mexico.

Report discussing geological investigations of the uranium-bearing nickel-cobalt-native silver deposits in the Black Hawk district of Grant County, New Mexico. Details of the area's geology are presented, and topographic and geologic maps are presented.

Report discussing the occurrences of uranium on the Merry Widow claim near White Signal, Grant County, New Mexico. "The writers mapped the Merry Widow claim in 1950, collected 133 samples, and logged the core from one diamond-drill hole on the Merry Widow claim."

A report regarding uranium deposits located in Grant County, New Mexico. This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.

A report made of the examination of a prospect in the White Signal mining district of Grant County, New Mexico.

Report discussing techniques for the mining of large masses of low-grade ores such as though found in Santa Rita, NM. It is hoped that a study of the methods used at Santa Rita will help engineers in other industries who may have to handle large masses of material.