What happened Shares of frack sand producer U.S. Silica Holdings (NYSE: SLCA) fell as much as 11% today and are down 8% as of 12:00 p.m. EDT. Today's decline comes after the company reported earnings that beat some analyst expectations, but revenue was lower than estimates. The company also announced higher levels of capital spending for the year. So what Depending on who you ask, U.S. Silica's most recent results either exceeded or did not meet expectations. The company's adjusted second-quarter net income result of $0.38 per share beat analyst expectations at Zacks, which were looking for adjusted net income of $0.37 per share. Conversely, though, estimates from another analyst group, FactSet, were looking for earnings of $0.39 per share. So, let's just call it a tie and say the company met expectations. Image source: Getty Images. In both cases, U.S. Silica's $290.5 million in revenue didn't meet either analyst group expectation. It should be noted, though, that revenue was up 148% compared to this time last year. Most of these gains relate to the frack sand market in general. Demand for sand is riding high right now, so total volumes and the price per volume are considerably better than they were a year ago. The biggest change at the company was a revision to its capital spending plan for 2017. After announcing it would build a new sand mine in the Permian Basin in June, management revised its capital expenditure guidance from $125 million-$150 million to $325 million-$375 million. This $200 million uptick is about the same amount of money it will cost to build its new facility, so we can assume the facility will be complete near the end of the year. Now what The frack sand industry has been on a tear lately as producers demand more and more sand per well. You couldn't tell this from U.S. Silica's share price, though, as shares are down 53% in 2017. Perhaps Wall Street expected the company to be doing better than it is considering the uptick in revenue, but costs have been high as management has invested in new facilities and expanded operations at its existing sand mines. From a long-term perspective, though, U.S. Silica is making the right moves. It's got ample cash on the balance sheet to reinvest in the business and a manageable debt load. Of the companies in the frack sand industry, U.S. Silica looks like one of the surer long-term bets. 10 stocks we like better than U.S. Silica HoldingsWhen investing geniuses David and Tom Gardner have a stock tip, it can pay to listen. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.* David and Tom just revealed what they believe are the 10 best stocks for investors to buy right now... and U.S. Silica Holdings wasn't one of them! That's right -- they think these 10 stocks are even better buys. Click here to learn about these picks! *Stock Advisor returns as of August 1, 2017Tyler Crowe has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. The Motley Fool has a disclosure policy.