The Mitchell H. Kline papers (circa 1950s-1970s) consist mainly of mechanical engineering and mining records, although some of Kline's personal materials are also present.

The Mitchell H. Kline photograph collection contains a personal portrait and 17 8x10 black and white photographs of the Rare Metals Corporation located in Tuba City, Arizona.

The Ezra Clark Knowlton papers (1919-1979) consist of materials surrounding Knowlton's involvement with various Utah public service organizations.

The Robert Gordon Larsen papers (1930-1972) contain correspondence, journal articles, notebooks, research proposals, and a scrapbook relating to the career of this Utah chemist. Larsen was an engineer and chemist principally with the Shell Development Company, a division of Shell Oil Company.

The J. Heinrich Lienhard papers (1843-1933) consist of a translated portion of Lienhard's diary about his life in California before and after the gold rush, and photocopies of correspondence, certificates, and other items relating to Lienhard and his family.

The Lincoln Mining Company records (1947-1950) contain correspondence, notices, obituaries, and a blueprint of the Lincoln mining district.

The Little Cottonwood Canyon history collection (1870-1965) consist of a microfilmed copy of a collection of clippings, notes, and transcriptions on the history of Little Cottonwood Canyon, kept by Lawrence P. James. The materials are weighted heavily toward mining in the nineteenth century, but contain information on the development of the ski industry in the twentieth.

The Little May Mining Company stockholders report (1927) gives descriptions of the various properties mined by the Little May Mining Company for the year 1951. It also provides a balance sheet with records of assets and liabilities, as well as a profit and loss statement for the company in that same year. The map (1951) shows properties in the Tintic and North Tintic mining districts, Utah, and gives a scale of annual production for the years 1869 to 1927.

The Augustus Locke papers (1911-2002) consist mainly of writings and mining reports, written by Locke (1883-1981), for mines and mining areas in Utah and California. Other areas of the western United States, as well as Mexico, are also represented. Locke was a mining and economic geologist.

The Joseph M. Locke papers (1861 and 1884) consist of manuscripts and notes regarding Utah gold coinage and collateral during the nineteenth century.

The Don Maguire papers (1899) consist of a speech given by Maguire, entitled "The Antiquities of the Southwest," given before the Utah State Historical Society, and color copies of a letter written by Maguire to Professor L. S. Ropes concerning various geological aspects of Utah.

The Mammoth Mining Company records (1899), contain receipts and assays concerning the mine, as well as a brief history. The Mammoth Mining Company was organized in Mammoth City, Calif. in 1878.

The Thorn Mayes photograph collection contains aerial views, 1934-1937, of the San Juan River drainage area, the Rio Grande watershed, and of the Navajo and Zuni Indian Reservations in New Mexico, Arizona, and Utah. This collection also includes an album of hand colored photographs of the Grand Canyon by Fred Harvey of the El Tovar Studio. As well as, slides of various areas in the southwest United States taken between 1962 and 1980.

The McIntyre family ranch scrapbook [photocopy] (1840-2006) is about the family ranch near the Tintic Mining Region in Juab County.

The Guy R. McKay papers (1935-1954) consist of an original and photocopy of a report by McKay titled "The American Flag Mine." The report was intended to furnish geological and engineering data to accompany an application of the Park City Development Company for listing its stock on the Salt Lake City Stock and Mining Exchange. A photocopy of McKay's obituary is also included in the collection.

The Patrick W. McKendrick papers (1936-1939) consist of McKendrick's hand-written manuscript, as well as a typescript, describing his metal recycling project at the Salt Lake City garbage dump. McKendrick staked a mineral claim at the dump during the 1930s and began a sluice operation to recover the iron, gold, and silver left by decomposing cans and garbage.

The Mitchell Melich papers (1932-1973) contain correspondence, cards, handwritten notes, notebooks, appointment books, travel itineraries, calendar books, passports, general Republican Party materials, mining materials, gubernatorial campaign materials, financial documents, and news clippings. This collection covers four main portions of Melich's life: mining, gubernatorial campaign, service in the Republican Party, and Solicitor of the Department of Interior.

The Mineral Flat Mining Company cash book (1908-1918) provides accounting information. Identified from stamp inside front cover.

The Mineral Hill Mining Company ledgers (1871-1879) consist of an account ledger and a payroll ledger.

The Mineralogical Society of Utah was organized in Salt Lake City to facilitate the study of mineralogy. The collection (1939-1990) contains records documenting the organization, operation, and activities of the society.