Final answer:
To calculate the burden in bench blasting, you need to calculate the concentration of the charge. The concentration can be calculated by dividing the energy supplied by the mass of the charge.
Step-by-step explanation:
To calculate the burden in bench blasting, you need to first calculate the concentration of the charge. The concentration can be calculated by dividing the energy supplied by the mass of the charge. If you have the energetic values in calories/g or calories/cm3, you can convert them to kcal/g and then use the formula: concentration (kg/m) = energetic value (kcal/g) / 1.6 x 10^7.
For example, if you have an energetic value of 5.8 calories/g, you can convert it to kcal/g by dividing it by 1000, which gives you 0.0058 kcal/g. Then, you can use the formula to calculate the concentration by dividing 0.0058 kcal/g by 1.6 x 10^7, which gives you the concentration in kg/m.