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The amount of ore processed at the plant has increased from under 50 000 t in 1994 to over 300 000 t in 1997 and over 400 000 t in 1998. Grades for the polymetallic ore in 1999 were 2.2 g/t Au, 251 g/t Ag, 1.4% Pb, 6.6% Zn, 0.6% Cu and 32.1% Fe. The distribution of the different metals in the various processing products is tabulated. The plant equipment is described and illustrated and a flowsheet is presented for the production of separate copper, lead and zinc concentrates., The amount of ore processed at the plant has increased from under 50 000 t in 1994 to over 300 000 t in 1997 and over 400 000 t in 1998. Grades for the polymetallic ore in 1999 were 2.2 g/t Au, 251 g/t Ag, 1.4% Pb, 6.6% Zn, 0.6% Cu and 32.1% Fe. The distribution of the different metals in the various processing products is tabulated. The plant equipment is described and illustrated and a flowsheet is presented for the production of separate copper, lead and zinc concentrates.

The section includes papers on: The dry stacking of flotation tailings at Pogo gold mine, Alaska; New mineral processing plant at the Tizapa mine, Mexico, in an expansion project; Recent milling operation at Batu Hijau mine, Indonesia; The current situation of mine water processing at Toyoha mines, Japan; Efforts on reducing milling costs at Huckleberry mine, British Columbia, Canada; The effect of countermeasures against the acid mine drainage sources in the old Matsuo mine, Japan; and Recent drilling works at the Sumikawa geothermal power station., The section includes papers on: The dry stacking of flotation tailings at Pogo gold mine, Alaska; New mineral processing plant at the Tizapa mine, Mexico, in an expansion project; Recent milling operation at Batu Hijau mine, Indonesia; The current situation of mine water processing at Toyoha mines, Japan; Efforts on reducing milling costs at Huckleberry mine, British Columbia, Canada; The effect of countermeasures against the acid mine drainage sources in the old Matsuo mine, Japan; and Recent drilling works at the Sumikawa geothermal power station.

Proven and probable reserves at Tizapa in 2010 totalled 12 737 557 t grading 1.72 g/t Au, 196.00 g/t Ag, 1.17% Pb, 5.16% Zn and 0.31% Cu. Production was 626 490 t at 1.83 g/t Au, 2.37 g/t Ag, 1.43% Pb, 6.30% Zn, 0.35% Cu and 34.47% Fe; three concentrates were produced, grading 24.32% Cu, 22.56% Pb and 51.17% Zn respectively, with 53.9% of Au and 62.83% of Ag recovered to the Pb concentrate. Ore microscopy shows freibergite ore containing inclusions of electrum, chalcopyrite, sphalerite and galena. A description is given of the expansion project, with schematic diagrams of the crushing, grinding, Pb-Cu, Cu and Zn flotation circuits and of the piping and instrumentation for the ball mill circuit, graphs of average annual Au, Zn and Pb recoveries from 1994 to 2010 and of annual changes in the Cu grade of the lead concentrate in that period, a typical analysis of the Knelson concentrate as 1 366 g/t Au, 113 g/t Ag, 1.87% Pb, 3.42% Zn and 0.22% Cu, and illustrations of equipment including the SAG mill, secondary and tertiary cone crushers, Knelson concentrator, Wemco and Denver flotation cells, Microcel and static mixer tube in the Pb-Cu column flotation cell, and Larox filter., Proven and probable reserves at Tizapa in 2010 totalled 12 737 557 t grading 1.72 g/t Au, 196.00 g/t Ag, 1.17% Pb, 5.16% Zn and 0.31% Cu. Production was 626 490 t at 1.83 g/t Au, 2.37 g/t Ag, 1.43% Pb, 6.30% Zn, 0.35% Cu and 34.47% Fe; three concentrates were produced, grading 24.32% Cu, 22.56% Pb and 51.17% Zn respectively, with 53.9% of Au and 62.83% of Ag recovered to the Pb concentrate. Ore microscopy shows freibergite ore containing inclusions of electrum, chalcopyrite, sphalerite and galena. A description is given of the expansion project, with schematic diagrams of the crushing, grinding, Pb-Cu, Cu and Zn flotation circuits and of the piping and instrumentation for the ball mill circuit, graphs of average annual Au, Zn and Pb recoveries from 1994 to 2010 and of annual changes in the Cu grade of the lead concentrate in that period, a typical analysis of the Knelson concentrate as 1 366 g/t Au, 113 g/t Ag, 1.87% Pb, 3.42% Zn and 0.22% Cu, and illustrations of equipment including the SAG mill, secondary and tertiary cone crushers, Knelson concentrator, Wemco and Denver flotation cells, Microcel and static mixer tube in the Pb-Cu column flotation cell, and Larox filter.