1. The undertakings:
- Billiton Nederland BV,
- Metallgesellschaft AG,
- Société Minière et Métallurgie de Penarroya SA,
- Preussag AG,
- Rio Tinto Zinc Corporation plc, and
- Union Minière SA,
infringed Article 85 (1) of the EEC Treaty over the period 10 July 1964 until the dates given below by engaging in the following practices either directly or indirectly through undertakings dependent on or controlled or acquired by them:
- until October 1977, by agreeing a zinc producer price,
- until April 1976, by taking collective action to influence the zinc price quotation on the London Metal Exchange,
- until the autumn of 1977, by agreeing or consulting on restrictions of output and investment,
- until the end of 1976, by agreeing to keep out of each other's home markets,
and by putting such agreements into effect.
2. Metallgesellschaft and Preussag also infringed Article 85 (1) by continuing the agreements on restriction of output beyond the date given above until April 1978 and Billiton and RTZ by continuing the agreements on market sharing until April 1978.