Potash is the common name given to any water-soluble salt of Potassium(K).
It can be:-
Potassium Carbonate - K2CO3
Potassium Hydroxide - KOH
Potassium Chloride - KCl
Potassium Nitrate -...
A potash laborer performs varying tasks in a potash mine; driving trucks, operating machinery, doing maintenance work, handling explosives, you name it.