Second-stage crushing at Loreto, Pachuca, Mexico, is as follows: 4-in. ore from the first crusher, combined with the undersize of a grizzly above it, is passed over two 4- by 8-ft. rod deck screens, the oversize of which is fed to two 5½-ft. standard secondary crushers, making a ¾-in. product. Each is driven by a 225-hp. motor ...