** Shares of Perpetua Resources PPTA.O fall 4.3% to $10.14 premarket
** PPTA launches public offering of 3.4 mln shares that are worth $36.5 mln as of last close
** BMO Capital Markets and National Bank of Canada Financial Markets are the joint lead book-running managers for the offering
** PPTA plans on using the proceeds for down payments on materials and engineering for its Stibnite gold project
** Co has 66.6 mln outstanding shares for $707.4 mln market capitalization - LSEG data
** As of last close, PPTA shares have more than tripled YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))