Well Drillers Near Deadwood, South Dakota
Deadwood area typical geological profile: thin surficial clays/gravel, followed by minor sand/shale, then thick sequences of schist or slate; residential wells usually reach fractured schist/slate for water.
Showing contractors within 60 miles of Deadwood. 22 results found.
- Typical depth
- 150 ft
- Water table
- 25 ft
- Contractors
- 22
22 Contractors
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View Local Geology Report
A geological estimate for the Deadwood area.
- Typical Well Depth
- 150 ft
- Static Water Level
- 25 ft
- Recommended Method
- Rotary - Mud Circulation
Detailed Summary
Based on a synthesis of multiple well logs from the Deadwood, SD area, the typical geology consists of a surficial unit (0-20 ft) of clay, silt, and/or gravel, underlain by weathered shale or sand with cobbles and occasional alluvial material (to ~50 ft). This is typically followed by an alternating sequence of shale, slate, or clay bands, and then a thick interval of fractured and competent schist or slate bedrock extending well below 100 ft. Water is most commonly found in fractures within schist/slate at depths of 70-180 ft. Static water levels are typically 6-50 ft. Drilling is most commonly air rotary or rotary-mud, sometimes with DHH or cable tool. Cement grout is standard, with steel or SDR casing. A typical residential well (5-15+ GPM) targets fractured schist/slate at 100-180 ft. Higher capacity wells may be drilled to 220-300 ft for more or larger fractures.
Expected Geological Layers
| Depth (Feet) | Formation Type | Description | Characteristics |
|---|---|---|---|
| 0 – 4 ft | Clay with some gravel or cobbles | Brown clay (sometimes with silt, cobbles, or minor fill material) | Color: Brown/yellow/gray Hardness: Soft |
| 4 – 20 ft | Clay, silt, minor sand/gravel, or weathered shale | Clay, silt, some thin gravel, occasional weathered shale or sand with cobbles | Color: Gray, brown, white Hardness: Soft to firm |
| 20 – 50 ft | Shale, sandy shale, or broken slate | Thinly bedded to fractured, some sand or gravel interbeds, minor quartz lenses | Color: Gray, black, yellow, brown Hardness: Firm to indurated |
| 50 – 90 ft | Schist or Slate - weathered and fractured | Gray, black, or yellow schist/slate, includes water-bearing fracture zones and minor quartz | Color: Gray, black, yellow, reddish Hardness: Hard |
| 90 – 180 ft | Hard Schist/Slate | Competent (sometimes fractured) gray/black schist or slate, usually main aquifer | Color: Gray to black Hardness: Very hard |
| 180 – 250 ft | Hard Schist/Slate and minor shale/limestone | Massive, competent metamorphic rocks with minor zones of shale or limestone lenses | Color: Gray, black, tan Hardness: Very hard |
| 250 – 300 ft | Schist/Slate, rare limestone or dolomite lenses | Continues as hard metamorphic bedrock; drilling typically terminates here for high-capacity wells | Color: Gray, brown Hardness: Very hard |