What's the difference between arrastre and wharfage?

Arrastre

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Definition:

• (n.) A rude apparatus for pulverizing ores, esp. those containing free gold.

Example Sentences:

Wharfage

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Definition:

• (n.) The fee or duty paid for the privilege of using a wharf for loading or unloading goods; pierage, collectively; quayage.
• (n.) A wharf or wharfs, collectively; wharfing.

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