Excellon Releases Positive Preliminary Economic Assessment on Platosa Optimization Project After-Tax IRR of 118% With Peak Production All-in Sustaining Costs of $9.00 per Ounce Press Release: Mining Exploration Update – 11 hours ago https://ca.finance.yahoo.com/news/excellon-releases-positive-preliminary-economic-110000294.html EXN.TO 0.53 +0.01