The Obama administration said Friday it will for the first time require companies drilling for oil and natural gas on public and Indian lands to publicly disclose chemicals used in hydraulic fracturing operations.

The proposed "fracking" rules also set standards for proper construction of wells and wastewater disposal.

Interior Secretary Ken Salazar said the long-awaited rules will allow continued expansion of drilling while protecting public health and safety.

"As we continue to offer millions of acres of America's public lands for oil and gas development, it is critical that the public have full confidence that the right safety and environmental protections are in place," Salazar said.

The proposed rules will "modernize our management of well-stimulation activities, including hydraulic fracturing, to make sure that fracturing operations conducted on public and Indian lands follow common-sense industry best practices," he said.