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in a higher than expected Meter discovered until the end of the change is not reflected in this Mine water usage underground wa in the plant was only monitored year. The usage for mining and the following assumptions: 2 usage. The leak was not 1990 water year, therefore the year's numbers. not metered. Mine water usage the last two months of the water preparation were estimated using - raw coal mined = 282,612 tons @ 9.4$ and an equilibrium moisture of 7.08$ - clean coal = 187,493 tons @ 11.23$ moisture - refuse = 112,011 tons @ 20$ moisture The added moisture during mining is calculated to be 1.58 million gallons or 5.6 gallons/raw ton. The added moisture during preparation is calculated to be 3.69 million gallons or 13,10 gallons/raw ton. The estimated domestic water usage was 4 gallons/raw ton. Another use of mine water was dust suppression on underground roadways. Magnesium chloride was used on the roads part of the year reducing the water consumption by an estimated 50$. Using 50$ of the 1989 estimate of 1500 gallons/day, 5 days/week and 52 weeks, an estimated 195,000 gallons of mine water were used on roadways. The use of Magnesium chloride and calcium chloride during part of 1990 on surface roads resulted in an estimated 40$ reduction in • water usage. Using 60$ of the 1989 estimate of 7500 gallons/day, 5 days/week, and 52 weeks/year an estimated 975,000 gallons of water were used for surface roads. A summation of the estimated consumptive use of water is as follows: Total Gallons/ Gallons/ Source Gallons raw ton clean ton Domestic Surface Facilities 1,484,000 5.3 7.9 Preparation Plant 1,130,000 4.0 6.0 Mine Mining 1,580,000 5.6 8.4 Preparation Plant 2,560,000 9.0 13.7 Underground Roads 195,000 0.7 1.0 Highline Canal Surface Roads 975.000 3.4 5.2 TOTAL 7,924,000 28.0 42.3 ]TRACTS The total dissolved solids discharged to the river from mine water was 436.4 tons during the year which represents 0.03$ of . the 1.34 million tons calculated to be carried in the River. The discharge to the old mine will eventually cause a discharge to the River. At that time the TDS loading will better represent the long term affect of the mining operation.