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This question already has an answer here:

Can Bitcoin mining hardware be used for other Crypto coins?

marked as duplicate by Murch Jun 15 '14 at 14:40

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You can do, if they are using the same mining algorithm. Bitcoin is using SHA256, here is a list of other coins using the same algorithm:

SHA256-Coins

Other coins like Litecoin are using the Scrypt algorithm, those are not compatible with bitcoin mining hardware.

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