Assertion: nickel's amount | /r/HasProperty | 23,000 tons
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text: The leading nickel producers are Indonesia, Philippines, Canada, and New Caledonia (together responsible for mining over half the world's nickel), followed by Australia and Russia; the United States currently has no active nickel mines but does produce a relatively small amount of nickel (23,000 tons—about 1/10 as much as Canada) as a byproduct from copper and palladium-platinum mines.