CUO sued them both to get out of paying for the 32.3 million tons of sand and gravel they did not excavate of the 50 million ton contract and also for alleged overpayments on the 17.7 mil they have excavated and paid for. Valco could go after CUO now for payment of that remaining 32.3 mil tons they contracted for. That is why they may need to establish a reserve. Really need more details. From the 10K:
2. CESSATION OF MINING AT LEASED PUEBLO GRAVEL SITE
In September of 2014 the Company ceased operations at its leased gravel operation in Pueblo, Colorado. This aggregate operation incurred significant operating losses in all but two years since 2005. The principal reasons for the operating losses were the high ratio of sand to rock and the high cost of complying with water augmentation requirements. Except for the sand required in the production of concrete, the demand for sand in the Pueblo area is very weak. The decision to shut down the Pueblo aggregate operation resulted in significant accounting charges in the third quarter of 2014. The Company recorded $4,000,000 to reflect the costs to backfill the mined gravel pit from a previous mining phase. Prior to the shutdown the reclamation plan was to fill this pit with waste material and tailings from the ongoing gravel operation. The Company also wrote-off $1,257,000 of unamortized deferred development expenses and $401,000 of prepaid royalties related to the minimum annual royalties paid during the period of operation. On September 10, 2014, the Company filed suit in Continental Materials Corporation v. Valco, Inc., Civil Action No. 2014-cv-2510, in the United States District Court for the District of Colorado seeking, among other things, to rescind the sand and gravel lease and to recover approximately $1,282,000 of royalty overpayments and $1,470,000 of royalties paid in excess of actual tons produced . The sand and gravel lease called for the payments of a royalty on 50,000,000 tons of sand and gravel reserves. Through the end of the third quarter of 2014 approximately 17,700,000 tons have been paid for, including the overpayments. After consideration of all facts and circumstances, including discussions with legal counsel, management concluded that no reserve was required to be recorded against the amount of overpaid royalties nor was a liability required to be recorded for royalties related to the remaining 32,300,000 tons of unmined sand and gravel.