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The flotation of lead and zinc oxidized and sulfide ores has a long history in Iran. Using thiols such as potassium amyl xanthate in lead flotation is very common. However, increasing the recovery of lead and silver in the current industry faces challenges. In this research, an attempt is made to investigate the synergistic effect of some collectors with potassium amyl xanthate to improve the recovery of lead and silver. First, 50 kg of medium grade lead and zinc oxide ore from Anghouran Mine was sampled. After crushing and milling up to the optimum d80, the characteristics of the sample were determined with optical and electron microscope studies, XRD, XRF, atomic absorption, and degrees of liberation. The experiment design was carried out classically to investigate the effect of parameters on the grade and recovery of lead and silver, such as particle size, solids percentage, preparation time, amount of sodium sulfide, and most importantly, the type of combined collector and their consumption. The results showed that the optimum flotation conditions to achieve the highest recovery of lead and silver in d80 equal to 90 µm, solid percentage %25, stirring speed 1000 rpm, 10 minutes sodium sulfide conditioning time, 6200 g/t Sodium sulfide and 600 g of potassium amyl xanthate along with 100 g/t of sodium diethyldithiocarbamate occur. The reason for choosing this combination of collectors is to increase the recovery of lead that is the production of lead concentrate in a larger weight with a higher silver grade and more profitability. The combination of xanthate and carbamate collectors can improve %8.7 of lead recovery and 273 g/t of silver grade compared to the conditions of a typical industrial plant. [ABSTRACT FROM AUTHOR]