Richard C. Adkerson - Freeport-McMoRan, Inc.
Management
So this is what we've done. With respect to our current operations – and it's the open pit mine, the DOZ essentially, but also running the mill with the ore flow delivery systems, with the concentrate delivery systems, using the slurry pipelines to get to the port, our relationship with our workforce and local community and security, all of those things are much, much improved and they are important. Then in terms of the Grasberg Block Cave development, which over the years with all the disruptions that we had from export bans and security issues and so forth, that's just gone really good. I mean, Mark Johnson and his team have done an exceptional job, and now, Mark, pipe up. But I say, we have completed and met all the risk of infrastructure development for the Block Cave mine, so that's important. That's not risk facing us. We are addressing the seismicity issue at the Deep MLZ. Early indications are that this fracking approach, which we've never used, but is common technology in the industry, is going to be very effective in dealing with that issue for us going forward. So, that's a major positive. So, milestones to watch. Beginning in the second half of 2019, we began block caving mining in the Grasberg Block Cave. That's very similar to – it's big, but it's very similar to what we've been doing now since early 1980s. We know the rock fully drilled, same rock that we mine from the pit. So, you'll be able to see the results of that in the second half of the year, the beginning results of it. And then, as we continue with this fracking operation in the Deep MLZ, we'll see the consequence of that, but we're really encouraged about it right now. So, how do I answer your question? There's always risk in mining. There's always risk in underground mining. But, Mark, why don't you...?