The approximate production cost of Metallica's 1991 album, commonly called The Black Album, was US$1 million.
The expense reflected a long and demanding recording process rather than a short set of basic studio sessions. Metallica recorded from October 1990 through June 1991, working mainly at One on One Recording Studios in Los Angeles and using additional facilities in Vancouver and Hollywood.
Producer Bob Rock pushed the band to record many takes and to assemble performances carefully. The musicians were known for perfectionism, and the sessions involved disagreements over arrangements, lyrics, performances, and sound. Those pressures contributed to the album's polished, forceful production.
The figure is a production-cost estimate, not the album's sales revenue or marketing budget. The record later became one of the best-selling albums in music history, making its original studio investment appear modest compared with its long-term commercial impact.