Just released another update to deal with a bug in GT through minetweaker.
It looks like some issues with hammers aren't going to be fixed until the 1.12 release which may still be a while, so we'll have to deal with them.
Hammers don't prospect and harvest most ores normally instead of crushing.
To fix this I've made redstone crushable through Craftweaker, as this should be the only thing you have to crush to get started with a macerator which will work for other ores.