Congressional Budget Office Cost Estimate: H.R. 3279, Helium Extraction Act of 2017 [open pdf - 100KB]
From the Summary: "H.R. 3279 would allow firms to retain federal oil and gas leases that would otherwise expire for the purpose of extracting helium. Using information from the Bureau of Land Management (BLM) and industry sources, CBO [Congressional Budget Office] estimates that enacting the legislation would increase offsetting receipts, which are treated as reductions in direct spending, by $9 million over the 2019-2028 period; therefore, pay-as-you-go procedures apply. The legislation would not affect revenues. CBO estimates that enacting H.R. 3279 would not increase net direct spending or on-budget deficits in any of the four consecutive 10-year periods beginning in 2029. H.R. 3279 contains no intergovernmental or private-sector mandates as defined in the Unfunded Mandates Reform Act (UMRA)."
Congressional Budget Office: http://www.cbo.gov/