Issued by China Nonferrous Metals Industry Corporation.
Drafting unit: China Nonferrous 14th Metallurgical Construction Company.
Centralized unit
Release date: 1993 65438+ 10/.
Implementation date: 1 may, 9941day
YBJ 22 1- 1990 Code for Construction Measurement of Mine Roadway Volume in Ferrous Metallurgy Mine
Standard number: YBJ 22 1- 1990
Release date: 1990
Implementation date:1991-0/-01
Effective or not: Currently effective.