In trading on Friday, shares of Northern Dynasty Minerals Ltd. (NAK) entered into oversold territory, changing hands as low as $0.9643 per share. We define oversold territory using the Relative Strength Index, or RSI, which is a technical analysis indicator used to measure momentum on a scale of zero to 100. A stock is considered to be oversold if the RSI reading falls below 30.In the case of Northern Dynasty Minerals Ltd., the RSI reading has hit 25.0 — by comparison, the universe of metals and mining stocks covered by Metals Channel currently has an average RSI of 54.3, the RSI of Spot Gold is at 63.3, and the RSI of Spot Silver is presently 54.0. A bullish investor could look at NAK's 25.0 reading as a sign that the recent heavy selling is in the process of exhausting itself, and begin to look for entry point opportunities on the buy side. Looking at a chart of one year performance (below), NAK's low point in its 52 week range is $0.9643 per share, with $3.63 as the 52 week high point — that compares with a last trade of $1.01. Northern Dynasty Minerals Ltd. shares are currently trading down about 32.2% on the day. According to the ETF Finder at ETF Channel, NAK makes up 2.95% of the First Trust ISE Global Copper Index Fund ETF ( CU) which is trading up by about 2.1% on the day Friday.