hard ore meaning in Hindi

Examples

1. A cone crusher is suitable for crushing a variety of mid-hard and above mid-hard ores and rocks.
2. Vein gold needed crushing, and they probably used crushing or stamp mills worked by water-wheels to comminute the hard ore before washing.
3. It is highly likely that they also developed water-powered stamp mills to crush hard ore, which could be washed to collect the heavy gold dust.