Useful metals come from rocks and minerals in the Earth’s crust. Metals-1-1 Image: G. Plumlee, USGS.

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Presentation transcript:

Useful metals come from rocks and minerals in the Earth’s crust. Metals-1-1 Image: G. Plumlee, USGS

Mining of metal-bearing rocks also requires removing less valuable rocks - waste rocks. Metals-1-2 Image: Kennecott Utah Copper Co.

Separating metal-bearing minerals from others produces waste called “tailings”. Metals-1-3 Image: Kennecott Utah Copper Co.

Environmentally sound disposal of waste rock and tailings is needed to protect soil and water resources. Metals-1-4 Before After Images: Gold Institute, Echo Bay Mines; S. Warren

Environmentally sound disposal of waste rock and tailings commonly uses soil covers that prevent erosion and development of acidic waters (acid rock drainage). Revegetated Pile Surface Compacted consolidated wasterock Soil Growth Medium Uncompacted Lime - amended wasterock 12” Metals-1-5 Image: Kennecott Utah Copper Co., DeAtley Design

In some cases, covering tailings with water prevents acid rock drainage and creates valuable habitat. Metals-1-6 BeforeAfter Images: Kennecott Utah Copper Co.

Historically, mineral processing to recover metals from minerals emitted large amounts of harmful gases and particles to the atmosphere. Metals-1-7 Image: Atlantic Richfield Company

Modern facilities to recover metals from minerals use new technology that reduces emissions below those permitted by regulatory agencies. Acid Mist – 151 Acid Mist – 48 Particulates – 728 Particulates – 400 SO ,050 SO 2 – 982 Discharges at Kennecott smelter in Utah. Comparison units in metric tonnes Modernized (Permitted) Smelter Metals-1-8 Image: Kennecott Utah Copper Co., DeAtley Design

Metals we need can be provided in environmentally sound ways. Metals-1-9 Image: Digital Vision