In the last article Hardrock Mining Drill Rig Selection – Part One, we introduce field application for Mining Drill Rig and the target for all application(Minimum Cost and Maximum Output), in today’s blog, we will give more detailed suggestions how to select proper rig for specific application.
Blasthole Drilling Operations Priority
- Focus on budgets and invoice costs
- Buys the largest hole diameter and the cheapest drill rig one can find or subcontracts the drilling
- Miminize moveability and versatility, service, spare parts, reliability, operational costs
- Proper criteria for us, Surface Study Program to get on right track.
- Balancing budget imperatives with applications issues
- Committee or application consensus drives selection
- Eliminate drill alternatives that don’t fit.
- Support, spare part issues. Create ” a standard” (spec, controls etc. for our advantage).
- Automation options to create enhanced value with low cost.
- Focus on lowest cost/ton operating scenario
- Creates a working operating economic cost model that demonstrates full process costs with internal and external factors
- Surface Study Program, Plant designer program, Sim Quarry.
- Run scenarios with different rigs and hole sizes.
- SanRemo, TIM3D and connections to existing mine automation systems to be monitored as a part of the process.
- Hole quality and it’s significance Lifetime support
Selecting the drill hole diameter
- Largely depends on desired production rate and rock drillability as well as rock properties
- Some factors restricting
- Required fragmentation size
- Ground vibration restrictions when blasting
- Selective rock excavation
- Smaller holes -> lighter explosives -> better fragmentation
- Lafarge Exshaw Cement Quarry
- Annual production 1,6 Million Tons
- Rock type limestone/dolomite (density 2 600 kg/m3)
- Primary gyratory crusher 1370 mm with opening 150 mm
- Blasthole drilling hole size and fragmentation
- Larger holes lead to coarser fragmentation
- Deeper sub-drilling and larger floor damage
- Thicker stemming and amount of oversize, fly rocks and wall/face damage
- Selecting the drill hole diameter Mining drilling as recommended in chart below
- Mining Drilling accuracy -> new technologies
- Blast Bore hole diameter and Penetrate Rate for Top Hammer, DTH and Rotary Drill Rigs
Choosing Right Rig for Right Purpose from HARDROCK
More Articles
- Hardrock Mining Drill Rigs Selection – Part One
- How Drilling Tools Selection Impacts Borehole Quality
- TOP 6 BRAND / Manufacturer For Drill Rigs
- How to Select DTH Hammer Drill Bit
- How to Select Rotary / Tricon Drilling Bit
- 7 Rules on How to Design Reverse Circulation System
- 6 Advantages of Reverse Circulation Vs Direct Circulation On Bore hole drilling
- 8 Points on How to Select Water Well Drilling Rig
- Market Survey Metals – Iron Ore
- Market Survey Metals – Bauxite, Alumina, Aluminium
- 7 Rules of Thumb for Open Bit Blast Pattern
- Mineral Commodity Summary
- Down The Hole Drilling Trouble Shooting – Bit Damage
- Down The Hole Drilling Trouble Shooting – Hammer Piston Casing Breakage
- Down The Hole Drilling Trouble Shooting – Treaded
- Selection of DTH Drilling Tools
- Rotary Drilling Method
- General Drilling Method and Application
- DTH Drilling Care & Maintenance – Part One
- DTH Drilling Care & Maintenance – Part Two
- Basic DTH and Top Hammer Drilling Knowledge
- Well Drilling Method
- Rock Properties
- Rock Drillability
- How to Repair Drill Bit
- DTH(Down The Hole) Drilling Application