Drilling & Trenching

GT Probe Bedrock Interface Sampling

GroundTruth’s Exclusive GT Probe is a powerful direct push probe mounted on a rubber tracked platform. The rod is quickly driven to bedrock interface, rock & soil sample is extracted and XRF analyzed on site to detect anomalies in real time.

 

Extremely Cost Efficient

  • Outperforms traditional trenching: more than 2:1 in production (175m/day)
  • No return trip for sampling, no return trip for reclamation
  • End cost is 1/3 of traditional heliportable trenching

 

 

Low Environmental Impact

The tracked GT Probe maneuvers around obstacles, Low ground pressure rubber tracks leave moss intact with low ground disturbance.

The GT Probe is a remotely controlled tracked platform with a hydraulically operated bedrock interface sampler mounted on a tilting mast. The GT Probe has 10645 cm² (1650 inches²) of track coverage with less than 1.5 psi ground pressure allowing it to be extremely versatile and low impact in the field. The entire unit is powered by a gasoline engine and is completely hydraulically operated. Samples are collected at 5m intervals in grid formation reaching depths between 2 and 4m, capturing the bedrock interface. 35 samples with weights averaging 8000gr/m are collected daily and analyzed by our onsite XRF technician. Each sample location is surveyed by DGPS. Daily data collected is sent nightly via satellite internet to our main headquarters and then available for the client the following day.

 

Technical Specifications

  • Length: 2.5m (96″)
  • Width: 1.25m (50″)
  • Height: 1.20m (48″)
  • Weight: 1110 kg (2450 lbs)
  • Down Force: 8165 kg (18,000lbs)
  • Track Surface Area: 10 645 cm²
  • Less than 1.5 psi ground pressure
  • Wireless Remote Driving Capability
  • 2 sling loads with Astar Helicopter

Sample Tube Specifications

  • Inside Diameter: 76mm
  • Outside Diameter: 88.8mm
  • Length: 100cm

Personnel

  • Lead GT Probe Operator
  • XRF Sampling Technician
  • Line Cutter / Sampling Assistant

 

Bedrock Interface sampling over IP/Resistivity structural targets

The track mounted GT Probe is designed to drive a cased hole to the bedrock interface and collect a representative rock sample to test for mineralization. Structurally defined targets can quickly be crossed with lines of GT Probe samples at a defined spacing, typically 5m. The track mounted platform is agile and designed to work in challenging terrain.

 

 

Tactical Exploration

  • Extremely Portable
  • Covers significantly more distance per day than
  • Environmentally friendly: No reclamation required
  • Safe operation: operated by wireless remote control
  • Crew camps on site when possible to reduce heli cost

Low Impact and Highly Mobile

  • Low ground pressure track system makes virtually no disturbance
  • The GT Probe can easily maneuver around trees, greatly reducing the need for cutting
  • The GT Probe is very agile, and can be safely operated on slopes up to 45°, using a winch for stabilization

 

Intelligent Sampling: Geoprobe + XRF

A continuous sample can be extracted from surface to bedrock interface. By analyzing sample with handheld XRF at multiple depths, the GT Probe team can instantly determine if they are sampling over mineralization (i.e. anomalous at bottom of hole), or sampling over dispersion train (anomalous mid depth). The GT Probe team is able to adjust their lines to actively vector to mineralization as they sample.

 

GT RAB Drilling (Bedrock and Overburden)

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The GT RAB Drill is a remotely controlled tracked platform with an onboard air compressor, tilting mast and rotary drill head. The RAB Drill has 10645 cm² (1650 inches²) of track coverage with less than 2.1 psi ground pressure allowing it to be extremely versatile and low impact in the field. The entire unit is powered by a 44hp Turbo charged Kubota diesel engine and is completely air/hydraulically operated.

 

GT RAB Technical Specifications

  • Length: 2.5m (96″)
  • Width: 1.25m (50″)
  • Height: 1.20m (48″)
  • Weight: 1540 kg (3400 lbs)
  • Pull Back Force: 7350 kg (16,200 lbs)
  • Onboard Air Compressor: 150cfm @ 175psi
  • Working Angle: -45° to -90°
  • 2.1 psi ground pressure
  • 60hp Turbo Charged Kubota
  • Wireless Remote Driving Capability
  • 2 sling loads with Astar Helicopter

Tooling

  • Diameter of bit: 90mm
  • Drill rod length: 1.5m
  • 50m capacity in rod basket
  • 1 sling load with Astar Helicopter

 

 

The track mounted GT RAB Drill with onboard air compressor is designed to drill a cased hole into bedrock with depths up to 30m with varying angles ranging from -65° to -90° degrees. Structurally defined targets can be quickly identified using this method.

When deeper holes are required, a larger stationary air compressor is brought onsite providing the capability of drilling up to 100m in depth with varying angles ranging from -45° to -90° degrees. The larger air compressor is attached to the GT RAB Drill using lengths of air hose allowing for a 500m radius to be drilled around the compressor eliminating the need for a helicopter when moving between drill targets.

 

Two Operating Modes

  • LIGHT RAB
    • Using onboard VMAC compressor, multiple short holes per day. Up to 30m depth in multiple
  • DEEP RAB
    • With additional 300/200 compressor. One hole per day. Up to 100m depth.

 

 

Each drill hole is cased from surface into bedrock. The average sample weight is 8000gr/m after splitting. Rock chip sample size is 6.35mm – 9.5mm and is analyzed by our onsite XRF technician.

Each sample location is surveyed by DGPS. Daily data collected is sent nightly via satellite internet to our main headquarters and then available for the client the following day.

 

Heliportable Excavator Trenching

Continuous exposure of mineralized rock using light equipment.

Helicopter transportable backhoe trenching is an effective method to test for mineralization in weathered bedrock. Significant Yukon discoveries such as White Gold and Coffee deposits were made with trenching using our hoes. The gear is proven, many kilometers of trench have been excavated to evaluate soil anomalies. We now recommend selective trenching as a followup survey to IP/Resistivity and Geoprobe to expose known mineralization, rather than general transection of soil anomalies; becoming a surgical exploration tool with reduced impact.

 

Advantages

  • Creates excellent exposure for mapping
  • Continuous profile is exposed
  • Helicopter portable in one Astar slingload
  • Works in steep/challenging terrain
  • Zones of specific interest can be exposed more extensively to detailed mapping.

Data Collection

  • Groundtruth provides experienced technicians to collect, record and GPS survey trench samples.
  • Samples are typically collected at 5m composite rock chip samples.
  • Sample location/description is digitally entered on handheld at site. Sample ID is barcode scanned.
  • All samples are photographed.
  • Trenches are surveyed with differential GPS.
  • Data is dowloaded and emailed to HQ nightly.
  • GT provides professional mapping service for plotting trenches and results.

 

Field Portable XRF

GT provides benchtop XRF analysis of soil samples using Innovx X-5000 unit. XRF can be used as a screening tool for results ahead of the lab to direct exploration programs, or as cost saving measure to replace conventional ICP-MS Analysis. 200 samples can be analyzed in one 8 hour shift, providing analysis results at ~1/5th the cost of the lab.