Copper prices took off this month after a tragic mudslide at Freeport McMoran's Grasberg mine. It has led to the idling of the world's second-largest mine and tipped the market into a deficit, according to Goldman Sachs.It will take until 2027 for that production to fully come back online. At some point, Cobre Panama should also come back online. It's the 10th biggest mine but has been halted by Panamanian authorities due to social unrest.The biggest signal though might be coming from QB2, which is Teck Resources new mine. It's turning into a lemon. The company cut ties with its chief operating officer at the mine last month after huge cost overruns and poor production. Today, Teck cut its guidance through 2028 (midpoint shown):2025: Guidance 180 kt vs Consensus 208 kt2026: Guidance 217.5 kt vs Consensus 257 kt2027: Guidance 257.5 kt vs Consensus 274 kt2028: Guidance 237.5 kt vs Consensus 272 ktCash costs are now $2.65-$3.00 lb as well and the company noted further downside risks to production in 2026 and 2027 if sand drainage or mechanical raises are not successful.The news highlights just how hard it is get new copper. The construction of the project was approved in 2018 (after decades of development) and it's been a headache from the start. The timelines are huge to bring copper projects online and we're just beginning to see the scope of demand for copper from electrification and grid upgrades. This article was written by Adam Button at investinglive.com.