It's a while since I last flew a Procurer with T1 fit but, as I recall, you should be able to get 4 loads per hour with modest skills and a decent fit ( you didn't mention a mining laser upgrade - make sure you fit one and a damage control unit in your low slots). That's roughly 8 million ISK/hour and it really doesn't matter which ore you are mining. You need to divide the price of the ore by the m3/unit to get a normalized price. Usually the best ore to mine is Scordite. You can improve this with skills and boosts. I was averaging 6 loads per hour ice mining in a high skill Skiff with Orca boosts - that worked out to about 18 million ISK/hour at the time - not sure what ice is worth these days. It doesn't get much better than that in highsec. In low/null you can get more powerful boosts from a Rorqual.

For me, the key is multitasking. I can do most industrial activities sitting in a mining barge, just as easily as sitting in a station. PI, research, manufacturing, whatever. It's an excellent way to earn a little more ISK while doing something else on the computer if you have a spare monitor. As a manufacturer, I use the minerals from the ore I mine - which saves me the time and effort of buying them and hauling them to my base.