Thanks..I would place both those activities under commercial activity for now and I will try to expand that segment at a later date. I have located a post on gambling which at that time suggested between 20 to 50% of (commercial) transactions are related to that
https://bitcointalksearch.org/topic/m.6129168
I imagine that percentage wise that will decrease as purchase activity increases .
With respect to mining monthly data can be found on # of coins mined. Those figures in turn will need an estimate of miners who mine and sell for fiat and those who mine and hold for increase in value (speculation) or mine and hold for other commercial activity/purchases. That whole sub sector is likely to be in the region of $2M / day or 60M /month (and maybe only 50% of that will be sold in the current market but thats just a guess for now)
https://blockchain.info/charts/miners-revenue
If you have other posts that would help please link.
Also it is likely that any purchase data may have to be cut in half..eg if the volume related to purchases is $5M then the actual purchases could well be $2.5 M as assuming they had to buy bitcoin first..use it to purchase goods or services and the entity that receives them will eventually convert to fiat that transaction will show up twice in $volumes. The same applies for remittances.