Abstract: The raw ore of a low-grade polymetallic sulfide ore containing gold,silver,copper,lead and zinc,located in
western Yunnan,containing copper of 0. 42%,lead of 0. 58%,zinc of 0. 60%,and sulfur of 11. 18%. The associated gold (Au)
and silver (Ag) contents are 1. 73 g/ t and 34. 66 g/ t,respectively. The main metallic minerals present in the ore are chalcopyrite,
pyrite,galena,and marmatite. The occurrence states of these sulfide minerals are complex,with relatively fine particle sizes.
Associated gold mainly occurs as silver-bearing native gold,while silver is predominantly hosted in pyrite,both exhibiting
fine-grained dissemination. The existence relationships among the major metallic minerals are highly intricate. This ore can be
classified as a complex iron sphalerite-type polymetallic sulfide ore with low grade,posing significant challenges for mineral
processing. To achieve efficient and comprehensive utilization of this ore resource,a systematic experimental study was conducted
on the sequential flotation process for the recovery of copper,lead,zinc and sulfur. The experimental results demonstrated
the successful production of copper concentrate with a Cu grade of 27. 25% and a recovery rate of 82. 40%,lead concentrate
with a Pb grade of 47. 33% and a recovery rate of 79. 16%,zinc concentrate with a Zn grade of 45. 79% and a recovery rate of
79. 37%,and sulfur concentrate with an S grade of 48. 88% and a recovery rate of 83. 20%. The principal valuable elements
(copper,lead,zinc,and sulfur) were effectively recovered,and the separation of different metal minerals was relatively complete,
resulting in low impurity levels in the concentrates. Furthermore,the total recovery rates for the associated elements gold
and silver reached 85. 71% and 85. 18%. The recovery indicators are highly favorable,providing robust technical support for
the development and utilization of this resource.

Key words: copper-lead-zinc-gold-silver polymetallic sulfide ore,secondary copper sulfide,marmatite,full priority flotation