Shandong Laizhou Sanshandao Gold Mine 4000m Test Borehole

Release time:

2024-10-18

 

2013 Shandong Geological Team 3

Geological Design

1. Design depth 4000m, final hole diameter water ≤ 75 m, core diameter water ≤ 46 m 
2, the whole hole core take rate of water ≤ 85%, ore-bearing segment take rate ≤ 90%

Final hole

Construction from September 2010 to May 2013, depth 4006.17m, aperture 75mm, core diameter 46mm, adoption rate ≤ 95%

Equipment

Drilling platform, vertical shaft drilling rig

Formation information

Precambrian basement rocks and ultra-high pressure metamorphic rock blocks consisting of Mesozoic tectonics and endogenic hydrothermal gold deposits with strong magma development 
Mineralization concentration area, stratum hard and slippery

Construction characteristics

Using φ60.3 once through drill pipe φ75 rope drill pipe combination drill pipe string to complete the final hole depth (drill pipe string upper 1200m common 
Drill pipe, lower rope drill pipe, drilling tool)

Drilling process scheme

Drilling tool configuration

Process technology point

open

Opening:The full drilling depth of φ170 bit is 32.80m

φ168 core tube φ170 alloy bit

1. H□ diameter (JS95B) drill pipe deep head 
The second breakthrough was 2000m, reaching 2230m hole depth. 
2, φ60.3 once through the drill pipe φ75 rope 
Drill pipe combination Drill pipe string Finish hole depth 
(upper drill string 1200m common drill pipe, 
Rope drill pipe for lower part)

Orifice tube: depth approx.32.80m

φ168 sleeve boot

Second opening

Drilling in:φ150 diamond core drilling

JS150 drilling tool φ150 diamond bit

Technical casing: depth approx.81.29m

φ146 sleeve boot

Three open

Drilling in:φ122 diamond rope core drilling

JS122 drilling tool φ122 diamond bit

Technical casing: depth approx.501.00m

φ114 casing boot

Four open

Drilling in:2230~2672 m, with φ75 diamond 
Rope core drilling;22302439.10m due to occurrence 
in-hole accident, useφ95 diamond bit reaming

φ75 drilling tool φ75 diamond bit, 
φ95 diamond bit reaming

Technical casing: depth approx.2439.10m.

φ89 sleeve boot

Five open

Drilling in:φ75 diamond wire coring drilling to final hole 
Depth

φ60.3 ordinary drill pipe φ75 rope drill pipe 
φ75 drilling tool φ75 diamond bit

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