Roger Holmberg's mathematical model, through an example in excel, we design a drill layout (4m X 4.5m). As a result, we obtain a basic P&V report (without considering ANFO or accessories). The calculations and formulas used in the excel sheet are based on the following works:



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Download Link
Design with Roger Holmberg - Excel
https://drive.google.com/uc?export=do...

Source 1
https://drive.google.com/uc?export=do...

Source 2
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Source 3
https://drive.google.com/uc?export=do...



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Chapters:
00:00 Introduction
00:25 Explosives
01:16 R. Holmberg
03:21 General Calculus
05:22 Division of labor into “5 sections”
06:55 Section A - Calculation of quadrants
07:56 Section B, C E - Help Holes
09:23 Section D - Contour Holes
09:51 Section E - Drag Holes



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Best wishes,
Studio Alexa