For Best Available Techniques, BAT, see the following links

 Ferrochrome
Riekkola-Vanhanen, M. 1999. Finnish Expert Report on Best Available Techniques in Ferrochromium Production. Helsinki, Finnish Environment Institute. The Finnish Environment 314.

 Zinc
Fugleberg, S. 1999. Finnish Expert Report on Best Available Techniques in Zinc Production. Helsinki, Finnish Environment Institute. The Finnish Environment 315.

 Copper and byproducts
Riekkola-Vanhanen, M. 1999. Finnish Expert Report on Best Available Techniques in Copper Production and By-production of Precious Metals. Helsinki, Finnish Environment Institute. The Finnish Environment 316

 Nickel
Riekkola-Vanhanen, M. 1999. Finnish Expert Report on Best Available Techniques in Nickel Production. Helsinki, Finnish Environment Institute. The Finnish Environment 317