It shall be the duty of the auditor general, on receiving said reports, and such other authentic information as he shall collect, to collate said reports and information, and make a report, giving the results only in tabular form, showing the quantity of coal mined during each year in each county, and in each important coal producing region, in a perspicuous form, separating the several kinds of coal into anthracite, semi-bituminous, bituminous, and splint or block coal, suitable for smelting iron, giving also from time to time the statistics of each region, from the beginning of its coal trade, so far as it can be ascertained; he shall also specially report the number of accidents resulting in death or injury, in coal mines in those counties where there is no mine inspector, classifying them according to the cause thereof, whether occasioned by fire, explosions, falls of roof or coal in shafts or slopes, or other causes under ground or at the surface.