Copper steadied above a four-month low and nickel hit a six-week high as polls showed rising support for the Remain camp, however the overall picture is still one of an evenly split electorate.
"The recent polls have given an impetus to the market. The FTSE is up and that's flowing through into today's more risk-friendly environment," Robin Bhar, head of metals research at Societe Generale, told Reuters.
However, Bhar cautioned: "But that can change hour by hour — the roller coaster ride will continue."
Three-month copper on the London Metal Exchange (LME) swelled 0.4 per cent to $4,552 per tonne, after small gains on Friday.
But nickel was the top performer on the LME, gaining as much as two per cent to $9,250 or its strongest level since 5 May.
Aluminium on the LME jumped 0.7 per cent to $1,615, Tin added 0.1 per cent to $17,025 however zinc shed 0.4 per cent to $1,981.