WebJun 1, 2015 · In order to break a smooth, correct floor we must find the perfect subdrill depth. This can be done by using a ratio of the burden. Subdrill Equation. Subdrill (feet) = 0.3 x Burden (feet) Subdrill (meters) = 0.3 x Burden (meters) This short video by Anthony Konya will demonstrate how to quickly calculate a subdrill to try on your next blast. WebThere is a complication regarding the above formula associated with the term 'charge weight'. Charge weight could imply the weight of ANFO at a density of 0.85 gm/cm 3 …
Blasting mechanics: Blasting design standards : Pit & Quarry
WebJan 4, 2024 · Variations in spacing to burden ratio. (iii) Variations in expected 90% passing size of the rock fragment. Different combinations have been studied to suggest the optimum burden-spacing for the experimental stope. The best suited combination of burden-spacing from the analysis is presented in Table 5. The stope height of 20 m was … WebThe Burden Suggested in Konya Formula is defined as the distance from the blast hole to the nearest perpendicular free face and is represented as B = (3.15*De)* (SGe/SGr)^ (1/3) or Burden = (3.15*Diameter of explosive)* (Specific gravity of the explosive/Specific gravity of the rock)^ (1/3). Diameter of explosive is any straight line segment ... heron suites southold ny
Blast Design Formulas PDF - Scribd
WebBurden and Spacing what is Burden What is spacing Burden and Spacing calculations Surface miningwhat is Burdenwhat is SpacingFragmented Rock … WebB * ( 1.25 * B)=0 .7*M c /PF , and simplifying, we have: 1 .25*B 2 = 0.7 * MC/PF . Solving: B= ( 0.56 * M c /PF) 1 / 2 And so, using “real-world" data for powder factor and burden-to-spacing ratio, we are able to estimate … WebMay 31, 2015 · We introduce two equations which are shown below: Burden In Imperial Units Burden (feet) = [ (2 x Explosive Density/Rock Density)+1.5] x Explosive Diameter (inches) Burden in Metric Units … heron suites