Rev. Rul. 75-122, 1975-1 C.B. 87

Mining; research and experimental expenditures . A domestic mining corporation’s expenditures incurred directly in the development of prototype mining equipment and in perfecting a new metallurgical process, including the cost of shipping mineral samples to the research laboratory, are research and experimental expenditures deductible under section 174(a) of the Code. However, the expenses for driving […]