Trick to remember "the metals which were known to the Indus valley people"

Harappan Civilization's People were familiar with these Metals 

(Trick: सोचता सिटी) 

सो- सोना(Gold) 
च- चांदी(Silver) 
ता- तांबा(Copper) 
सि- सीसा(Led) 
टी- टिन(Tin)