某鉱山(非鉄金属)における業務上災害について

Abstract

A survey has been made on cases of occupational accidents occurred in a (non-ferric) metallic mine three years from June 1956 to June 1959. The results can be summarized as follows. 1. Incidence rate of accidents especially of minor accidents in increasing from year to year. 2. While rock pieces falling from the ledge, wagons, rolling or flying pieces of rock are main agents of accidents inside the mine, mineral and other materials, machines and tools occupy most of the agents of accidents outside the mine. 3. Of all the accidents 75 per cent have occurred in miners working inside the mine, among which direct laborers have accident rate 2 to 3 times as much as indirect laborers. 4. Parts of the body suffered most from the injury for all the workers are in the order: upper extremities, lower extremities, head, and trunk. But, in so far as accidents inside the mine concern, trunk injuries come to the third. 5. The day when accidents occur most is the first day after the off-day and the fourth day comes next. Accidents occur most three to four hours after the commencement of work. Therefore, increase of fatigue, decline of attention, and deterioration of enviromental conditions accompanying the increase if intensity, density, and speed of work are considered to be the causes of accidents. 6. Incidence rate is highest in the age group of 45-50 years. As to the length of employment, the rate is highest in enployment less than six months, and 15-20 years come next. 7. The more overcrowded employers' dwelling conditions, the higher the rate of accidents. 8. Those who has suffered from accidents twice a year and more have been looked upon as accident-prone.