I go through 3/4 inch chisels at the rate of about 1 a week under my idea of normal usage. That's Lowes and Home Depot specials. I wish I knew where I got it, I have a 1" flat chisel that is about 4 inches shorter then when I bought it and I still haven't sharpened it yet. Its about due though. So far my dry blade on my angle grinder seems to be doing really well. I make a few slices and then chip out an inch and a half to 2 inch chunks. Sometimes you can give your chisel a cleavage point in a tight crack just by making a dent in the rock with the grinder. Inch by inch but at least I'm not cutting through the pockets and the diamonds themselves. What are you mining for? If you ever make it down NY way I can show you what I got going on in my claim.