Investing in a hard-rock gold processing plant with a capacity of 5 tph (tons per hour)—translating to a daily throughput of approximately 120 tons—typically requires a total budget of between $200,000 and $450,000. This investment covers the entire suite of equipment—ranging from ore crushing and grinding to beneficiation and purification—as well as ancillary costs such as facility construction and environmental compliance approvals.

Within this production line, the ball mill serves as the core grinding unit; its specifications and cost directly determine the operational efficiency of the entire system. For a 5 tph throughput, the recommended models are the Φ1200×4500 or Φ1500×3000 ball mills. Both models offer a standard output range of 3 to 6 tph, perfectly matching the 5 tph production requirement while providing a reasonable margin of excess capacity.

Regarding technical specifications, these medium-sized ball mills typically require a feed size of less than 25 mm and can control the discharge particle size between 0.074 mm and 0.4 mm, fully meeting the fineness requirements for subsequent flotation or cyanidation processes. The grinding media charge is approximately 5 to 7.5 tons, and the motor power ranges from 55 kW to 75 kW.

For hard-rock gold grinding, a grate-discharge ball mill is the preferred choice. This discharge method facilitates rapid material outflow and minimizes over-grinding, thereby effectively increasing gold recovery rates. Additionally, the standard high-manganese steel liners offer excellent wear and impact resistance, significantly reducing long-term consumable and maintenance costs. In terms of budget allocation, the purchase cost for this core ball mill is approximately $40,000 to $50,000, representing a critical investment for ensuring the efficient operation of the processing plant.