There were also no lost time injuries or fatalities recorded during the year.
Elsewhere, Tango last week asked for more time to raise US$7.65mln to buy Firestone’s BK11 Botswana operations.
Talks are underway to agree revised terms and timelines or to terminate the deal.
Tango added it had also recently suspended its bulk sampling programme at its Oena alluvial diamond project to allow it to assess progress and draw up a new operational plan.
Since 6 August, 18,455 tonnes have been processed recovering a total of 37.68 carats.
In Nicaragua, Tango has received notification from the Ministry of Energy and Mines that the mining concession called El Santo will be revoked as the property was inactive for four years.