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M <br />Filtration - Thickened flotation products are dewatered <br />further by vacuum filtration, and then stockpiled for ship- <br />R' • ment to further refining off-site. <br />The Mayflower Mill facility has operated under the present <br />process scheme at the 1,000 TPD level since reactivation in 196D. <br />The original tailings disposal system employed at the Mayflower <br />was utilized by Standard Metals on tai]ings pond No. 2 until 1974, <br />and on pond No. 1 until 1975. In 1976 an entirely new tailings <br />disposal site and transport system were constructed and the old <br />ponds abandoned. During construction of the new tailings disposal <br />system, mill tailings deposition occurred on small interim impouncl- <br />ments identified as Inactive Tail Pond No. 3 and Office Settling . <br />Ponds which occupy approximately 17 acres at present. Construction <br />of the new mill tailings disposal site, identified as Tailings Pend <br />No. 4 was completed in August 1976, and tailings deposition commenced <br />on the site at that time. The gravity launder and spigot system <br />previously used for transport and placement of mill waste solids were <br />replaced .with an underground pipeline for tailings slurry transport <br />from the mill, and a cyclone separator for placement or deposition. <br />Depositional method selected for tailings disposal is a modified <br />- downstream technique in which the cyclone separator moves along a <br />designated centerline and the tailings slurry particles are segr•e- <br />gated into coarse (+200 mesh) and fine (-200 mesh) fractions ba<_;ed <br />on specific gravity. The coarse particles are deposited downstream <br />of centerline, forming the tailings retention dam or embankment, <br />and the tailings fines and slurry water are deposited in sequenr_e to <br />the pond's interior or upstream of centerline. Tailings deposition <br />• <br />x <br />zs <br />