Rammelsberg

Rammelsberg silver discovered at Goslar - massive silver vein found in Harz Mountains, transforms Ottonian economy

Otto I develops Rammelsberg mines - imperial control of silver enables strong central government, funds Italian campaigns

German silver floods Europe - Rammelsberg output triggers economic revival, new coinages, expanded trade networks

Rammelsberg funds Otto III's Roman renovatio - silver wealth enables imperial ambitions, 'renewal of Roman Empire'