LME 3-month zinc last at $4,020, up $20 vs PM kerb after sharp overnight drop in tandem with copper; some dip-buying providing a lift, but dip below key $4,000/ton leaves zinc looking "precarious" technically, says Standard Bank, with near-term direction to hinge on copper. China metal consultancy Antaike suggests China zinc exports may fall later in year as domestic demand rises, government discouraging exports; current 5% tax rebate on exports may go later in year, leading to short spike ahead of cut-off date, but lower exports overall.