Queensland mineworkers have protested outside BHP's Brisbane offices to demand more assistance for black lung and silicosis sufferers.

The Mine Dust Diseases Victims Group wants a fund established to help victims after their workers compensation payments finish.

So far, the group says, the mining companies have resisted.

Jim Pearce, a former coal miner and Queensland MP, says more than 100 mineworkers have now been diagnosed with mine dust diseases in Queensland.

"These guys are very sick, their families are suffering and their communities are suffering because they're losing good people to disease," he said on Friday.