Mumbai, Jan. 6 -- Silver prices climbed above $79 per ounce on Tuesday, extending gains for a third straight session and edging closer to record levels as fresh geopolitical tensions boosted safe-haven demand. The US military operation in Venezuela and the capture of President Nicolas Maduro rattled markets, with reports also suggesting President Donald Trump threatened further military action if interim leader Delcy Rodriguez failed to meet US demands. Investors are now closely watching a series of key US jobs reports due later this week. Silver's rally is also supported by ongoing supply concerns and robust demand from both industrial applications and investment flows. In the domestic market, MCX March silver futures advanced 1.6% to Rs.2...