Here's the thing...granulated copper is **** near impossible to sell in less than a semiload, and even then the few odd lot buyers will hit you, especially if you don't have an assay report. Granulated copper, especially number two is hard to get right. "Dust" and "some plastic here or there" adds up to percentage points gone. Most granulated copper goes to a mill where they have requirements to make a certain product. Granulated copper is perhaps the hardest thing to sell, believe it or not.
Why? Because granulating and getting both high percentage recovery and high percentage clean copper is an art and a science. They make it seem easy. It's not, especially if you have random employees doing it a few hours a week as needed. Especially #2 wire. Sure, the sales guys at granulator manufacturers will make it seem like a free ATM, that's not the case.
Frankly, most places struggle with #2, and especially stuff below your average lamp wire. They may even have a crappy machine and not even know it...there's a difference in machinery.
It's up to you the know what you have. Get a gram scale and start stripping and find out. Even then, some copper will be lost in processing. Most wire is granulated with a 20c per pound window of paying for machinery, expenses, and profit. That cost only sort of goes down with a bigger machine, but with labor needed to feed, not so much. You have to have semi loads a day to even do anything truly remarkable, and that's only a few yards across the country.
I'd spend more time on learning recovery rates and educating your buyer if needed...accepting that "right" 'might be only halfway to reality. You can give them 35% wire and if they themselves can only recover 15%, guess what...most yards will make nearly the same selling wire as is versus a granulator margin anyway. Plenty of salespeople, so few buyers willing to do math.
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