Concentrates, 32,929 short tons = 76·08 per cent. of charge. Fine sulphide ores, 9,590 " = 22·16 " " Limestone, 762 " = 1·76 " " —————— —————— Total charge, 43,281 " = 100·00 " " Weight of “calcines” produced, 35,533 " = 82·10 " " —————— —————— Shrinkage, 7,748 " = 17·90 " " ====== ====== The total costs of roasting (from roaster charge-bins to reverberatory furnace) worked out at 38·45 cents per ton, the distribution of these costs being as follows:— Total Costs. Cost per Dry Ton. Sampling, $222·62 $0·0051 Bedding, 2,016·27 0·0466 Reclaiming, 3,072·71 0·0710 Operating furnaces, 7,680·58 0·1775 Hauling calcines, 911·01 0·0210 General expenses, 1,639·99 0·0379 ———————— ——————- Total direct costs, $15,543·38 $0·3591 Cost of flux, 1,097·85 0·0254 ———————— ——————- Total costs, $16,641·23 $0·3845 ========== ======= ANALYSIS OF COST— (1) _Operating_— Labour, $7,398·56 $0·1709 Power, 1,577·64 0·0365 Fuel, 773·08 0·0179 Water, 78·71 0·0018 Sundries, 10·30 0·0002 Flux, 1,097·85 0·0254 —————————— ——————-—— $10,936·14 $0·2527 (2) _Repairs_— Labour, $2,507·35 $0·0579 Shop expense, 361·00 0·0083 Supplies, 2,836·74 0·0656 ———————-—— ————-—— Total costs, $16,641·23 $0·3845 ========== ======= References.