US fracking firms stay in top gear despite oil price slump.

US fracking firms stay in top gear despite oil price slump. UNFAZED by slumping oil prices and battering in the stock market, firms that supply sand and guar gum for shale oil and gas companies are not ready yet to call an end to a four-year boom spurred by hydraulic fracturing technology.Just putting on a brave face as a downturn looms? Perhaps, but the optimism could also reflect confidence that the US shale industry is more resilient to retreating...