From Scope of Report: "This paper is based upon the observations made and the records received while dredging and hydraulic-mining operations were visited in Alaska during 1946 and in California during 1946 and 1947. Data from 30 active dredging operations and 34 active hydraulic operations are incorporated in this paper."

From Purpose of Report: "The purpose of the report is to point out what the mine-management official, the safety engineer, and the chemist, can do to utilize analyses of complex gas mixtures as basis for safe procedure to (1) control and extinguish fires in mines, tunnels, and individual plants and (2) prevent explosions when dealing with explosive mixtures and sources of ignition. The report is designed to meet the needs of those desiring to utilize analyses of complex-gas mixtures for the above-mentioned purpose."

From Introduction: "The purpose of this investigation was to determine whether the coal from beds mined in the Schwager and Lota mines will produce metallurgical coke suitable for use in the blast furnaces at the proposed steel plant at Conception, and whether the quality of the lower-rank coals from other areas in Chile, especially those in Magallanes, where the large coal reserves of Chile appear to exist; can be improved by processing."

From Introduction: "Work on this project was begun early in 1944; and the results with respect to shale oil are reported in this Bulletin. Since this bulletin is only an index to this large repository of ideas relating to the the treatment of shale oil, the material is presented in the form of short notices describing the subject material of each patent, which consist of an abridgment of the patent (if British or Australian) or a typical claim in the case of the United States or foreign patents."

Report issued by the Bureau of Mines on the motor-fuels sold during the winter of 1947-1948. Characteristics of the fuel samples obtained are listed. This report includes tables, graphs, and a map.

Report issued by the Bureau of Mines regarding the chromite deposits in Stillwater and Sweetgrass counties. Characteristics of the chromite samples are presented. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over studies conducted on the pilot plant in Laramie County, Wyoming. As stated in the introduction, "the purpose of this report is to record information derived from recent experimental work that had as its objective the development and demonstration of one method of producing sponge iron" (p. 2). This report includes tables, illustrations, and photographs.

Report issued by the Bureau of Mines on motor fuels sold during the summer of 1948. The properties of the fuel samples are presented. This report includes tables, graphs, and a map.

Report issued by the Bureau of Mines over studies conducted on the iron-nickel deposits of Kittitas County, Washington. As stated in the introduction, "the investigation consisted of road building, diamond drilling, sampling, and metallurgical tests" (p. 1). This report includes tables and maps.

Report issued by the Bureau of Mines on the Coso mercury deposits of Inyo County, and development of the bucket drill for obtaining samples. Descriptions of the physical features of the deposits are listed. This report includes tables, maps, photographs, and illustrations.

Report issued by the Bureau of Mines over exploration of mineral deposits on Beryl Mountain. As stated in the introduction, "testing by surface cuts, trenching, and tunneling was conducted by the Bureau of Mines from August to December 1943" (p. 1). This report includes maps.

Report issued by the Bureau of Mines over studies of mica deposits throughout four counties in Georgia. Descriptions of the physical features of the mines, and deposits are presented. This report includes tables, maps, and photographs.

Report issued by the Bureau of Mines regarding explosions that took place on two separate cargo ships in 1947. The observations, data collected, and testing done during investigations of the disaster are presented. This report includes photographs, and illustrations.

Report issued by the Bureau of Mines on the motor-fuels sold during the summer months of 1947. The types of fuels sold, and characteristics of the fuel samples obtained are listed. This report includes tables, and graphs.

Report issued by the Bureau of Mines over exploratory work conducted on the bauxite deposits of Arkansas. Descriptions of geophysical characteristics and core drilling results are presented. This report includes tables, maps, illustrations, and photographs.

Report issued by the Bureau of Mines on the development of efficient mining methods for producing oil shale. Characteristics of the oil shale deposits of the Green River are presented. The results of core drilling and sampling in this area are also listed. This report includes tables, illustrations, maps, and photographs.

Report issued by the Bureau of Mines over studies conducted on the meta-anthracite of Rhode Island. The physical and chemical characteristics, geology, and petrography of the deposits are presented in three parts. The methods used in the study are also listed. This report includes tables, maps, photographs, and illustrations.

Report issued by the Bureau of Mines over the progress made on flood prevention in anthracite mines. As stated in the report, "the broad objective of the investigative work was to obtain factual data on: 1. anthracite reserves of Pennsylvania, 2. underground water pools, 3. barrier pillars, 4. the "buried valley" of the Susquehanna River, and 5. infiltration of surface water into underground mine workings" (p. 4). This report includes tables, graphs, maps, photographs, and illustrations.

Report issued by the Bureau of Mines over the progress made in emergency mine communications. The results of testing done on low-frequency radio communication are presented. This report includes tables, graphs, illustrations, and photographs.

Report issued by the Bureau of Mines over studies conducted on the Melrose zinc-lead deposits. Methods used in the investigation are listed. The characteristics of the zinc-lead deposits are presented also. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over studies conducted on the Blewett zinc-lead mine of Illinois. Samples obtained through churn-drill and diamond drill holes are analyzed. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over studies conducted on the production processes of iron-free alum. This is the second part of the report, and focuses on the development and operation of a continuous pilot plant. This report includes tables, graphs, photographs, and illustrations.

Report issued by the Bureau of Mines over exploration of iron ore deposits in four counties in Georgia. The physical features, geology, and analysis of ore samples are presented. This report includes tables, and maps.

Report issued by the Bureau of Mines over exploration of iron ore deposits in four counties in Georgia. The work accomplished during the summer of 1945 in these deposits is presented. The report describes physical features, geology, and characteristics of the ore samples collected. This report includes tables, maps, and illustrations.