Use "mine of information" in a sentence

1. A good encyclopedia is a mine of information.

2. A good encyclopaedia is a mine of information.

3. This book is a mine of information on the Romans.

4. Study a local map and the Ordnance Survey, which is a mine of information.

5. Synonyms for 'Anecdata': information, data, content, news, fact, detail, findings, A to Z, report, word, the 411, a mine of information (on/about)