The underlying index, which this ETF aims to track, selects companies based on two main criteria: they must have generated positive total revenue and shown a positive production value from the combined mining of lithium, nickel, and cobalt in the preceding year. This "production value" is specifically the dollar market worth of the battery metals extracted. Ordinarily, the fund commits a significant portion—at least 80%—of its net assets (including any funds borrowed for investment) to the securities within this index.