Thanks everyone. It's great to be here to provide an update on Meeka. The first thing that I want to talk to this morning is our operating performance over the last six months, which quite frankly has been disappointing. We've underperformed our own expectations and the expectations of our shareholders. I think if you look at the share price on the bottom left-hand side of the slide over the last six months, that's a direct reflection of that underperformance. Saying that, the drivers of that underperformance are well understood. We know exactly what's causing that. It's largely a result of open pit mining productivities not matching the plan. Underperformance from an open pit mining perspective. Well understood. We've addressed those problems. We're in the process now of ending open pit mining. We're transitioning entirely to underground mining.
The open pit mining contractor is demobilizing from site as we speak, therein lies the opportunity. The next thing I want to talk about this morning is our incredibly valuable processing and support infrastructure. The mines that we operate, the resources that support those mines, the growth opportunities afforded to those resources, importantly, the cash generative production going forward. Over the last two years, we've invested AUD 145 million in building out and expanding an infrastructure base to support a strong and stable production plan. What I mean by strong and stable, I mean 10+ years of production. We have the resources in the plan to support that, drilling right now is supporting the growth of those resources. We're coming to the end of that capital investment phase.
The capital investment process that we've been performing over the last two years, that aggressive investment to build out that infrastructure is tapering off. Our expenditure profile is falling away. In combination with the underground mining plan going forward, grade will improve into the plant, production will improve, cash flow will improve. If you look at the top right-hand side of that slide, we've just come out of the June quarter. We've been entirely reliant on, or largely reliant on open pit mining. As I said, underperformance from a productivity perspective, inability to get to that high-grade material in the pits has hampered our production plan and the gold that we're producing. We're just in the process now of starting stoping and ramping up stoping at our first underground mine.
We're going to see a material increase in underground material hitting the mill this quarter, that will drive improved production out of the plant. The second thing that I'll point to is, as I said, our investment phase is tapering off. The expenditure profile of the business is starting to reduce and quite meaningfully. This quarter will be a meaningful reduction on the expenditure from the last three to four quarters, that reduction will continue to taper. That investment cycle is largely concluded now. That in combination with the higher grade that we're getting out of the undergrounds, higher production, better cash flow. We expect that by early next year, we'll almost entirely be feeding the mill from underground sources, certainly by the end of this financial year, it'll be entirely from the two underground mines that we'll be operating.
In terms of our operating footprint, the support infrastructure is largely located in the northwest. Our accommodation village, processing plant, all of the administration complex, and our first underground mine at Andy Well, which we developed about 12 months ago. We've just started stoping. We're ramping up stoping there. We have a 20 km private haul road down to the southern operations, where we've just concluded the open pit mining activities, and we're just about to start development of our second underground mine. Andy Well, this is key to production for us over the coming six months. As I said, we've just started stoping. Stoping started late last quarter. We're starting to get that high er grade material hitting the plant now. The first 12 to 18 months of mining at Andy Well is focused in the upper levels.
It's shallow mining. We're in that zone 200 odd meters from surface, it's very shallow. We're accessing all of that production from existing infrastructure, from existing decline infrastructure. It's relatively rapid, low cost, startup. As I said, key to production over the coming quarters is the ramp up of that stoping. We're seeing that hit the plant now. The mineralization at Andy Well, it's sheeted, high grade sheeted, quartz lodes. There's three lodes. They're sub-parallel. They're about 200 meters apart. Our focus up until last quarter has largely been on developing Wilbur, which is on the western side. This is in plan view now. Our focus has been on developing the Wilbur lode. We've just accessed last quarter and started ore development on Judy North, which is a completely virgin ore body.
Later this year, we'll be accessing another new ore body at Suzy. What we're seeing from an underground perspective, we perform all of the underground mining ourselves, owner/operator. Not only does that give us a cost advantage over using contractors, but we're also seeing that the productivity issues that hampered the open pit performance are not evident in the underground. We're able to achieve the plan. We have been achieving the plan for the last 12 months with development. We've just started stoping. We're achieving that stoping plan and the ramp up of that stoping. The other thing that we're expecting to see, and we have seen over the last 12 months, is that we're going to see as the mine opens up, more work areas become available, productivity improves.
The other thing that's really important to understand about Andy Well, I mentioned that we're operating in the top 200 meters below surface. The grade is phenomenal. Double digit grades. You can see some of them called out on the slide there. The magenta shapes that you see on the slide there, that's not the entirety of the resource. That's purely the resource that's above 15 grams per ton. It's very high grade. The shoots have very good down plunge continuity. These high grade shoots have very good down plunge continuity. The other thing that we know from drilling is that the grade improves below the levels that we're currently mining. We've had really good outcome, really good performance from this mine to date.
We know as we get deeper and the levels subsequent to what we're mining now, that improves. The other thing that's apparent from the continuity that we see in these high-grade shoots is that we're expecting that with further drilling, we're going to be able to add to this resource. Drilling out down plunge of these areas where we've got good drill density, we expect that resource to grow, and we'll be doing that this year. The second underground mine that we're just about to start development. Open pit mining concluded in this pit a week ago or so. Again this is a mine that's going to be largely supported by existing infrastructure. Again, the capital's been spent here. The administration workshop, all of that infrastructure has been in place. It's been supporting open pit mining activities.
It's now used by the underground team. There is a little bit of capital that we need to do. The civil works for the underground support, the power station and mine services has been completed. We're going to input the power station and all of the rest of that infrastructure in this quarter. We expect to cut the portal in September. We'll be developing that mine through the December quarter, and we expect to be in first ore, delivering ore to the mill by early next year. It's a very straightforward production plan. Simple top-down mining strategy. The ground conditions at Turnberry are very good. Lends itself to a simple mesh and bolt support regime. Rapid development, quick turnaround times on that development, highly productive. The mineralization, again, is slightly different to what we see at Andy Well.
Much broader zones of high-grade gold, and importantly, the drilling results that we've just received. We put out drilling yesterday. They demonstrate that this mineralization has very good down plunge continuity, well below the existing reserve and the mine plan. The exciting thing, and my background's mining engineering, and I'll try not to butcher this description of what we're understanding around the mineral system, but I think it's important to understand the growth opportunity that we see here at Turnberry and more broadly within this Archean greenstone belt that hosts Turnberry and three kilometers to the south of Turnberry at St. Anne's . What we see at St. Anne's , we see a very high-grade gold system, quartz, lots of visible gold, and that's associated with arsenopyrite. That's circa three kilometers to the south of Turnberry.
As we move towards Turnberry, and then for the southern end of Turnberry to the central zone, we see the intensity of shearing, the prevalence of pyrite increasing. That indicates to us or our geology team that we're getting from a cooler mineralizing environment with that arsenopyrite high-grade gold to a hotter mineralizing environment. The pyrite's dropping out with that high-grade gold. Now what we're seeing in this drilling that we've just done is we're starting to see small amounts of chalcopyrite. It's very common in these high-grade Archean orogenic gold systems. As you get deeper into a hotter part of that mineralizing environment, you start to see a little bit of chalcopyrite come in. What that's telling us is, as we're going from St. Anne's at the south towards Turnberry Central, we're seeing increasing amounts of pyrite.
It's getting hotter. As we're getting into Turnberry Central, drilling deeper, we're getting into an even hotter environment. Potentially, there's some magmatic involvement below Turnberry Central. The motor that's driving this big system, if you think about the strike from the northern end of Turnberry to the southern end of St. Anne's that we know about now, that's about five kilometers. It is a big system. It remains open to the north and south. We're starting to get into the hotter zone or potentially the driver of this mineralizing system, and we're drilling right now along strike and below those results. That's roughly 200 meters below the previous results within that ore body or that load. That's really exciting, and we'll have the results starting to come through in the next couple of months as that diamond core is processed.
Good potential to expand on that initial mine plan that we've got there. More broadly from an exploration opportunity, our focus over the last three to four years has really been drilling out the open pit and to a small ext ent, the underground resource at Turnberry and St. Anne's since we made that discovery there a few years ago. We previously haven't put the capital into that shear zone between Turnberry and St. Anne's . We're starting to do that now. Now that we're in cash flow, we're starting to reinvest in that organic growth opportunity. This is very broad-spaced reconnaissance, first pass drilling. Those drill lines are circa 200 plus meters apart. We're starting to see broad zones of gold, very similar to what we saw at Turnberry early on when they were drilling that out, very broad step out.
There's still a little bit of drilling we need to do between Rosapenna, which is that initial area we've got results for and to the south. That's a three-kilometer search space, so it's meaningful, it's large. The results that we're seeing today point to potential resource growth. We'll finish drilling out that corridor. We'll come back, we'll infill, put denser drilling in and around those existing results, drill out that mineralization to a point where we can put it in a resource, and then more broadly beyond that. That's that five-kilometer corridor between Turnberry and St. Anne's . Beyond that, we've got another 15 kilometers of this Archean greenstone. Same geology, same shear zone, and in theory, that mineralization has meaningful potential to extend to the south.
We feel not only a good opportunity initially to extend the resource with further drilling that we're doing at the moment at Turnberry, but also a significant opportunity to add with more shallow resource within that corridor, and then more broadly within that greenstone belt. Appreciate your time this morning. We'll be at the booth. If there's any questions, please come and see us at the booth.