на ... горизонте
• These ores are mined at different levels.
• An appreciable amount of development was conducted on the Nchanga horizon.
• Electric locomotive haulage will be used on the main levels.
Русско-английский научно-технический словарь• These ores are mined at different levels.
• An appreciable amount of development was conducted on the Nchanga horizon.
• Electric locomotive haulage will be used on the main levels.
Русско-английский научно-технический словарь