There will be a recovery loss but I doubt it would be more than 5% from pregnant Cu in solution based on industrial results ie with ASX listed FND or Tiger metals .
Here is a young guy who shows you a bench test of the resultant recycled recovery of Cu as a collector metal using electroplating his two prior videos in the series are similar to what BBX is doing with smaltering out gold from ore .
Be interested to read your metallurgists opinion on here