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The high-grade ore carried 100-400 ounces of silver and 0.5-3 ounces of gold.
Surgical instruments are made of titanium, plastic, ceramic, aluminum, or a high-grade nonmagnetic stainless steel.
During this time Zeiss has been a leader in improving the quality and performance of high-grade optical equipment.
At first, miners separated high-grade ore from waste rock underground by hand.
Many mines have zones of high-grade ore that are very profitable to mine.
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