The Colorado Springs City Council has voted to spend $4.12 million on land the city has leased for four decades from the state.

The Gazette in Colorado Springs reports that the council voted unanimously Tuesday to buy the 640-acre parcel that’s between Bear Creek Canon Park and Red Rock Canyon Open Space. Most of the money to buy the land will come from the city’s open space sales tax.

Colorado Springs negotiated for more than a decade with the Colorado State Land Board to acquire the parcel. One of the sticking points was the mineral rights, which the state is required to retain.

The city will pay $321,000 for the land board’s agreement not to develop the rights for 99 years. The site could be mined for gravel.