Metals comes in from metal scrappers and from the garbage trucks who have separated it out and are selling it on the way to the landfill.
In the bigger cities like Mexico City and Puebla there are of course very large scrap yards. Here in the outskirts of Oaxaca City, folks make do with mini-balers and manual labor to run the yard.
When you don't have a shredder, you have to play Tetris with you long hauling to maximize the weight and space of your load.
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