ore Industrial grade Boundary grade Non-ferrous metal copper Cu 0.4%-0.5% 0.20% Lead Zinc Pb Sulfide ore 0.7%-1.0% 0.3%-0.5% Mixed mine 1.0%-1.5% 0.5-0.7% Oxidized ore 1.5%-2.0% 0.5-1.0% Zn Sulfide ore 1.0%-2.0% 0.5%-1.0% Mixed mine 2.0%-3.0% 0.8%-1.5% Oxidized ore 3.0%-6.0% 1.5%-2.0% Bauxite (Al 2 O 3) Lucai ≥55% ≥40% Pit mining ≥55% ≥40% Tungsten Black tungsten 0.12%-0.18% 0.08%-0.1% White tungsten 0.15%-0.2% 0.1%-0.12% Sand tungsten 0.04% 0.02% molybdenum 0.06%-0.08% 0.03%-0.05% nickel 0.3%-0.5% 0.2%-0.3% tin 0.2%-0.4% 0.1%-0.2% magnesium Dolomite mine ≥19% Magnesite ≥42%~46% antimony 1.50% 0.70% HG 0.08%-0.10% 0.04% cobalt Sulfide, cobalt (cobalt and arsenic) 0.03%-0.06% 0.02% Cobalt ore 0.50% 0.30% bismuth 0.50% 0.20% black metal iron Open hearth Rich mine Magnetic, red, imaginary hematite 55 50 Brown, goethite 50 45 blast furnace Rich mine magnetite 50 45 Red, imaginary hematite 45~50 40～45 Brown, goethite 40～45 35～40 Siderite 35～40 30~35 Self-fluxing ore 35~38 28~32 magnetite 25% 20% Hematite 28%-30% 20% Siderite 25% 20% Limonite 30% 20% titanium Primary mine Rutile ≥3~4% ≥2% Titanite ≥8~10% ≥5~6% placer Rutile ≥2kg/m 3 ≥1kg/m 3 Titanite ≥15kg/m 3 ≥10kg/m 3 vanadium Separate deposit V 2 O 5 0.5 to 0.70% Vanadium is an associated component deposit ≥0.1%-0.5% manganese Manganese oxide Rich mine ≥30 ≥20～25 Lean mine ≥20 ≥10～15 Manganese carbonate Rich mine ≥25 ≥15～20 Lean mine ≥10～15 ≥8 Iron manganese ore ≥10～15 chromium Primary mine Rich mine ≥32% ≥25% Lean mine ≥8%-10% ≥5-8% placer ≥3% ≥1.5% Precious metal gold Rock gold 3-5g/t 1-2g/t silver 100-120g/t 40-50g/t Rare earth Light rare earth ( 铈æ—) 镧 , 铈, 镨 , é’• , é’œ, é’ , é“• Fluorine-bearing carbon ore, monazite primary ore 1% 0.5% Monazite sand mine and weathering crust 300～500g/m 3 100～200g/m 3 Heavy rare earth ( é’‡æ—) é’‡, é’† , 铽 , é• , é’¬ , é“’ , é“¥ , 镱 , é•¥ Containing yttrium (xenotime, gadolinite) pegmatite carbonate rock 0.05 to 0.1% Phosphonium ore deposit and weathering crust deposit 50～70g/m 3 30g/m 3 strontium Sr (lapisin mineral) 60% 40% Rare metal é’½ Ta open air 20～30g/ m3 10 g/m 3 underground 50～60 g/ m3 20 to 25 g/m 3 Electric Trolling Motors,Outboard Trolling Motor,Electric Outboard Trolling Motor,Trolling Motor For Inflatable Boat Ningbo Haishu Hongkang Outdoor Industry & Trade Co., Ltd , https://www.hktrollingmotors.com