Activities undertaken in 1977 by NIOSH in relation to the Federal Coal Mine Health and Safety Act of 1969 are reviewed. Funding for these activities totaled 4.4 million dollars and covered the costs of the medical examinations and autopsy program, clinical and rehabilitation research, engineering research, epidemiological and industrial hygiene research, and laboratory research and services. Of the miners examined in 1977, 98.7 percent had no evidence of pneumoconiosis and approximately 95 percent had no evidence of any other abnormalities. Major projects included an international workshop on Diesel Equipment in Underground Coal Mines, reports on job stress in coal mining, mortality among coal miners, ongoing clinical and laboratory studies, and approximately 300 autopsies. Other activities included the testing and certification of coal mine dust personal sampler units, respirators, gas and vapor detector tubes, sound level meters, safety eyewear, miners' helmets, welders' filter plates, and noise dosimeters.