Rock gold ore grade classification

The grade of a rock gold ore refers to the ratio of the gold content of the ore to the total mass of the ore, typically expressed in grams per ton (g/t). It is a key indicator of the economic value of a rock gold deposit and directly affects the feasibility, costs, and profitability of mining.

I. Definition of Rock Gold Ore Grade

The grade of rock gold ore directly reflects the gold content per unit of ore. A higher grade means more gold can be extracted per ton of ore, and thus greater economic value. In mining development, grade is a key factor in determining mining priorities, beneficiation methods, and smelting processes. Low-grade deposits require large-scale mining and efficient beneficiation technology to be profitable, while high-grade deposits can be valuable even on a smaller scale.

II. Factors Affecting Rock Gold Grade

1.Geological conditions of mineralization: Hydrothermal activity, tectonic zones, and surrounding rock properties control the degree of gold enrichment.

2.Mineralization types: Grades vary significantly between different mineralization types, such as quartz veins and altered rocks.

3.Weathering and oxidation: Supergene processes may lead to secondary gold enrichment, resulting in locally elevated grades.

III. Rock Gold Ore Grade Classification

High-grade ores: Typically above 10g/t, suitable for direct use with low-cost smelting processes.

Medium-grade ores: 1–10g/t, requiring recovery through flotation, cyanidation, and other processes.

Low-grade ores: Below 1g/t, requiring heap leaching or bioextraction, relying on economies of scale.

As high-grade gold resources gradually deplete, the reuse of low-grade ores and tailings has become a priority. Accurately assessing grade, optimizing rock gold beneficiation processes, and controlling costs are key to increasing rock gold beneficiation returns.