Figures from the Turkish Statistical Institute say that in the first nine months of the year, Turkey bought $900 million in gold mined in Venezuela - revenue that has helped replace the government's crashing oil revenues.
One of the agreements formalizes cooperation between the state-owned oil companies Petróleos de Venezuela S.A. (PDVSA) and the Turkish Petroleum International Company, in addition to an agreement to avoid double taxation and tax evasion.
Maduro contends he is the victim of an "economic war" led by US-backed adversaries.
"Whatever Venezuela produces, it has a right to sell in the world", Maduro said.
Speaking at a joint press conference with Turkish President Recep Tayyip Erdogan, Nicholas Maduro expressed hopes that Erdogan's visit would pave the way for a "new phase" in relations between the two countries.
In November, Washington imposed new restrictions against Venezuela targeting its gold exports.
Russian President Vladimir Putin right greets his Venezuelan counterpart Nicolas Maduro during their meeting at the Novo Ogaryovo residence outside
Hit by low oil prices, mismanagement, hyperinflation and the impact of USA sanctions, Venezuela's economy has plummeted.
Hit by U.S. and European Union sanctions, and ostracized as a dictator by Western powers for his brutal suppression of the opposition - many of whose leaders are in jail or exiled - Maduro has recently reached out to Washington's foes in a bid to raise investment.
The US has accused Venezuela's government of violating human rights and triggering an economic meltdown.
The meeting with Putin will let Maduro "close the year 2018 with a flourish, in terms of strategic relations that Venezuela is building with the world", he said.
Massive inflation and a shortage of basic commodities such as foodstuffs and medicine have forced an estimated 2.3 million Venezuelans to immigrate to other South American countries.