-edit-
it's tricky because Harder Mining disables the whole file, not just the individual materials. If you're not comfortable tinkering with raws I'm not sure this is the right solution. I really don't think it's related to the crash anyway. If you want to do the simplest possible raw tinkering to clear the error log, I suggest deleting the reactions, not adding the material.
Searching for: REACTION:LANDMINE_TOXIC
N:\Games\DF\MasterworkDF v3b\Dwarf Fortress\raw\objects\entity_default.txt(1353): [PERMITTED_REACTION:LANDMINE_TOXIC]
N:\Games\DF\MasterworkDF v3b\Dwarf Fortress\raw\objects\reaction_masterwork.txt(14566): [REACTION:LANDMINE_TOXIC]
Found 2 occurrence(s) in 2 file(s)
remove the one line in the entity and the whole reaction ("paragraph") in reaction
Searching for: REACTION:TURRET_WARPSTONE
N:\Games\DF\MasterworkDF v3b\Dwarf Fortress\raw\objects\entity_default.txt(1366): [PERMITTED_REACTION:TURRET_WARPSTONE]
N:\Games\DF\MasterworkDF v3b\Dwarf Fortress\raw\objects\reaction_masterwork.txt(14646): [REACTION:TURRET_WARPSTONE]
Found 2 occurrence(s) in 2 file(s)
The above will clear your error log, I'll be surprised a bit if it fixes your crash though. If you are experiencing crash only with Deep Drow in your world please see here
http://www.bay12forums.com/smf/index.php?topic=127247.msg4321577#msg4321577