# Blast Hole Pattern & Charge — Burden Spacing Powder Factor

> Burden Spacing Powder Factor (iPhone/iPad app by Shanghai Sheyuan Network Technology Co., Ltd..)

- Source: https://appshunter.io/ios/app/blast-hole-pattern-and-charge/id6761641301 (this page in markdown: same URL + `.md`)
- Developer: [Shanghai Sheyuan Network Technology Co., Ltd.](https://appshunter.io/developer/1560626858)
- Category: Utilities, Productivity
- Price: $4.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: English
- Released: 2026-04-07
- Data updated: 2026-07-08
- User reviews in markdown: https://appshunter.io/ios/app/blast-hole-pattern-and-charge/id6761641301/reviews.md

## What is Blast Hole Pattern & Charge?

Wrong burden or spacing means flyrock, poor fragmentation, or wasted explosive. This calculator designs safe, efficient blast patterns based on hole diameter, rock type, and bench geometry.

Enter hole diameter, depth, bench height, face width, subdrill, stemming, rock hardness (soft to very hard), and pattern type (rectangular, staggered, triangular). Calculates burden, spacing, total holes, rows and holes per row, powder factor, charge per hole, total charge weight, and total drill footage.

Rock hardness presets for limestone, shale, sandstone, slate, granite, basalt, and quartzite with industry-standard burden multipliers. Shows powder factor with safety threshold warning.

KEY FEATURES:
- Three pattern types with layout preview
- Powder factor calculation and warning
- Subdrill and stemming sizing
- Total drill footage estimate
- Works completely offline

Built for drill and blast engineers, quarry operators, and mining contractors.


## Version history (last 3 releases)

### 1.2 — 2026-06-27

Added a More Pro Tools section to discover related field calculators.

### 1.1 — 2026-04-13

Bug fixes and performance improvements.

### 1.0 — 2026-04-07

No release notes.

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All apps by Shanghai Sheyuan Network Technology Co., Ltd.: https://appshunter.io/developer/1560626858

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-08.*