Quick AnswerFor hard-rock gold, the secondary crusher has to survive silica. Most hard-rock gold deposits carry enough quartz that abrasiveness - not just compressive strength - drives liner wear and downtime. That is why a cone, and specifically a single-cylinder hydraulic cone (CS·CH series), tends to be the right secondary for this ore: the laminated crushing chamber handles abrasive feed without eating blow bars, the discharge setting stays put under load, and a closed circuit holds the mill...

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