Calculator
Enter bench dimensions and spacing values. The result appears above this form after submission.
Example Data Table
| Scenario | Bench Length (m) | Bench Width (m) | Hole Spacing (m) | Row Pitch (m) | Production Height (m) | Total Holes | Estimated Volume (m³) |
|---|---|---|---|---|---|---|---|
| Small Cut | 12 | 8 | 2.5 | 2.0 | 4 | 25 | 500.00 |
| Medium Bench | 18 | 10 | 3.0 | 2.5 | 5 | 35 | 1312.50 |
| Large Bench | 24 | 14 | 3.5 | 3.0 | 6 | 35 | 2205.00 |
Formula Used
Bench Area = Bench Length × Bench Width
Holes Per Row = floor(Bench Length ÷ Hole Spacing) + 1
Rows = floor(Bench Width ÷ Row Pitch) + 1
Total Holes = Holes Per Row × Rows
Pattern Area Per Hole = Hole Spacing × Row Pitch
Volume Per Hole = Pattern Area Per Hole × Production Height
Estimated Volume = Volume Per Hole × Total Holes
Adjusted Volume = Estimated Volume × (1 + Allowance ÷ 100)
Depth Margin = Hole Depth − Production Height
How to Use This Calculator
- Enter the overall bench length and width in meters.
- Set the planned spacing between holes along each row.
- Set the row pitch across the bench face.
- Enter hole depth and production height.
- Add a contingency percentage for field variation.
- Click Calculate Layout to show results above the form.
- Review the Plotly chart and download CSV or PDF if needed.
FAQs
1. What does this calculator estimate?
It estimates a simple bench drilling layout using entered row pitch, hole spacing, depth, and production height. It summarizes hole count, area coverage, and excavation volume for planning discussions and recordkeeping.
2. Why is the result shown above the form?
Showing the result above the form keeps the most important outputs visible immediately after submission. It also makes exports easier because the summary block stays near the chart and download buttons.
3. What is row pitch?
Row pitch is the distance between adjacent rows across the bench. It affects total row count, pattern area, and the excavation volume represented by each layout position.
4. What is hole spacing?
Hole spacing is the center-to-center distance between neighboring holes along the same row. Larger spacing reduces hole count, while smaller spacing increases density across the bench length.
5. Why include a contingency percentage?
A contingency or allowance percentage helps you create a buffered estimate. It can reflect field tolerances, excavation variation, or small changes between the planned and executed layout.
6. What does depth margin mean?
Depth margin is the difference between entered hole depth and production height. A positive value means the drilled depth exceeds the production height used in the volume estimate.
7. Can I use feet instead of meters?
Yes, but keep every input in the same unit system. If you use feet for length, width, spacing, and height, the area and volume outputs will follow that same unit basis.
8. Are the exported CSV and PDF files automatic?
They are generated directly in the browser after a result exists. Click the export buttons to save a summary of the current calculation without re-entering the data.