‘Back In Black’ – Top 100 Classic Rock Songs It's a lesser statistic, but somehow it speaks most loudly: AC/DC's 'Back in Black' received the RIAA's Master Ringtone Sales Award (Gold and ...

We're after pure gold, but rock that contains gold also includes lots of other materials such as quartz, calcite, and the sulfides of other metals. Since we need to separate the gold from the rest ...