Estimate the hourly production and unit cost ofrockexcavation by drilling and blasting.The rock is a lime-stone having a seismic velocity of6000 ft/s (1830 m/s).Trial blasting indicates that 31/2-in.(8.9-cm) holesdrilled in an 8-ft (2.44-m) rectangular pattern willprovide the desired fracturing.A hole depth of20 ft(6.1m) yields an effective depth of18 ft (5.5 m).Theaverage drilling rate is estimated to be 70 ft/h(21.4m/h).Apowder factor of1 lb/BCY (0.59 kg/BCM)ofANFO will be used.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more