30 CFR §71.500

1. (a)Each operator of a surface coal mine shall provide and install at least one sanitary toilet in a location convenient to each surface work site. A single sanitary toilet may serve two or more surface work sites in the same surface mine where the sanitary toilet is convenient to each such work site.
2. (b)Where 10 or more miners use such toilet facilities, sufficient toilets shall be furnished to provide approximately one sanitary toilet for each 10 miners.
3. (c)Sanitary toilets shall have an attached toilet seat with a hinged lid and a toilet paper holder together with an adequate supply of toilet tissue.
4. (d)Only flush or nonflush chemical or biological toilets, combustion or incinerating toilets, sealed bag toilets, and vault toilets meet the requirements of this section. Privies are prohibited.