Mechanical Mining Technology for Inclined Thick Gold Ore Deposits

Inclined thick gold ore bodies feature complex occurrence conditions, high mining difficulty, and high safety risks. Traditional mining methods suffer from low efficiency, high dilution, and high loss rates. This blog summarizes core characteristics, applicable mechanical mining methods, field parameters, and practical effects with complete data indicators.

1. Characteristics & Mining Difficulties

• Dip angle: widely ranges from 15° to 85°, with irregular changes
• Ore body thickness: 1m to 30m, average 6–19m
• Surrounding rock: mainly phyllite, schist, marble; most have poor stability
• Core risks: roof fall, high ore dilution & loss, difficult transportation

2. Applicable Mechanical Mining Methods

2.1 Mechanized Open-Stope Mining

• Applicable for stable surrounding rock
• Equipment: rock drill, scraper, jumbo, LHD
• Methods: large-span wall mining; small-span room-and-pillar mining

2.2 Mechanized Backfill Mining

• Applicable for poor stability, high safety & environmental requirements
• Mode: mining and backfilling simultaneously
• Typical schemes: sub-level open-stope backfill, upward slicing backfill
• Typical parameters: stope width 15m, sub-level height 15m

2.3 Mechanized Continuous Mining

• For stable ore bodies with uniform thickness
• Equipment: continuous miner, conveyor, remote control LHD
• Hole diameter: 165mm; capacity: 1000–1300 tons/day

3. Field Engineering Case (Jiaojia Gold Mine)

• Ore body dip: 16°–31°; average thickness: 4.16m
• Strike length: 798m; dip extension: 362m
• Method: large-span closed full-mechanized mining
• Stope length: 50m; level height: 30m
• Pillar size: 4m×4m; pillar spacing: 10–12m

4. Mechanical Equipment Configuration

• Drilling: 7655 rock drill; YSP-45 upward drill; drilling speed 8–20m/h
• Blasting: multi-row millisecond blasting; hole spacing 1.0–1.5m
• Loading: 30kW main scraper; 7.5–15kW auxiliary scraper
• Support: MQT-120 bolt rig; anchoring force ≥ 80kN

5. Field Application Effects

• Daily output: increased from <20 tons to 64.84 tons
• Annual output: over 15,000 tons
• Ore dilution rate: from 18% to 7%–9%
• Ore loss rate: from 15% to 5%–7%
• Annual extra recovered ore: 780 tons
• Safety risk: reduced from 13% to 0% (zero accidents)

6. Conclusion

• Mechanical mining greatly improves efficiency and resource recovery for inclined thick gold deposits
• Open-stope, backfill, and continuous mining match different geological conditions
• Mechanization reduces personnel, lowers risks, and realizes safe, efficient, green mining
• Future direction: unmanned mining, intelligent monitoring, green backfill