Trade mining is a transaction based system that rewards traders on a platform when a transaction is executed. Upon execution of a trade, the traders are financially rewarded a specified percentage of the trading fee, typically in the form of the native token of the exchange.
The trade mining on a platform will continue until a specific limit of rewards have been given out to traders or when a time frame of the trade mining ends. Other conditional factors can be added to trade mining such as daily limits or other adjustments based on transaction volume.
ProBit will have trade mining for PROB. To see more information on the trade mining program on ProBit, see this link.