* Shopify ( SHOP ) set for biggest one-day gain in nearly a year

* Gold rally lifts mining shares by 4.8%

* Gran Tierra Energy ( GTE ) jumps over 40% on South American asset

sale plan

By Sudeshna Ghoshal

August 5(Reuters) - Canada's main stock index notched a

fresh high on Wednesday, lifted by a surge in Shopify ( SHOP ) shares

after the e-commerce company's revenue forecast exceeded

estimates, while gains in gold prices lifted mining stocks.

The Toronto Stock Exchange's S&P/TSX Composite index

was up 1.6% by 10:15 a.m. ET, clinching a record high

for the second straight session.

* Shopify ( SHOP ) led gains on the index and was on track

for its biggest one-day gain in nearly a year, climbing over 15%

after its upbeat revenue forecast signaled its AI efforts were

drawing more merchants to its suite of e-commerce services.

* The broader technology index advanced 4.8%.

* "Shopify ( SHOP ) is obviously a bellwether for tech in Canada...

when these companies report good earnings ... it adds to this

idea that tech companies are still doing well, that the AI spend

is not stopping," said Allan Small, senior investment adviser of

the Allan Small Financial Group with iA Private Wealth.

* Thomson Reuters ( TMSOF ) also beat second-quarter profit

and revenue estimates and raised its annual revenue growth

forecast, though its shares were down 1.3%.

* Mining shares gained 4.8% as gold prices surged, after

hopes of a U.S.-Iran peace deal tempered some inflation

concerns.

* NovaGold, Eldorado Gold ( EGO ) and Discovery

Mining ( DSVSF ) were up between 8.2% and 8.6%.

* Six of the 10 major sectors on the TSX were trading

higher.

* Among individual stocks, iA Financial ( IAFNF ) shares

gained more than 4% after the insurance and wealth manager

topped quarterly core EPS estimates.

* Gran Tierra Energy ( GTE ) jumped 49.3% after the oil and

gas producer said it had agreed to sell its Colombian and

Ecuadorean oil operations to France's Maurel & Prom

for $1.33 billion, including debt.