sheet. In the last 12-24 months, we've added about AUD 150 million cash, but that's after we've spent AUD 130-odd million growing our reserves to 1.5 million ounces. That's after depletion. Today, we sit there at 1.5 million ounces of reserves. We've also spent about AUD 70 million or AUD 80 million bringing these satellite deposits online. We've also spent about AUD 40 million on one-off capital items like power plants. We don't need to build another power plant going forward. We've redoubled the size of the camp, we don't need to go and build another camp. It's all been in the journey of digesting this capital on our pathway, we hope, to 2 million ounces, and on our pathway, we hope, to 200,000 oz of reserves.
Very much the plan is to continue these efforts over the next 12 months of building cash on the balance sheet while digesting that capital during these high gold price environments. Where has that left us in the last 2026? We have had here, as you can see, gold production lifting over the last sort of three years. This last year, as these satellite deposits came online, it was demonstrating our success in that area of developing mines, bringing higher grade ore into a central processing hub, and utilizing all of that existing infrastructure. Our costs have moved around a bit, and we hope they'll come down to a more lower level of 2.5 or below as those higher grade ore feeds, such as Trident, a 5 g ore body, starts to come online later this financial year.
A quick summary to go through this. I said I'd move through this quickly, and hopefully, I can live to that and hand you over to Alex as Managing Director, Brightstar . We sit here and look at the infrastructure that we've got. We've got a processing plant there. We've put in new crushers. We've put in new liners. We're putting in new elution circuits. We've expanded the camp, as we talked about, and we're currently using that haul road down the middle of the belt, and we've been using that for quite some time with zero safety incidents and really getting into the swing of things on hauling quite a lot of dirt around the belt. We've got an upgraded power plant and constructing the largest tailings dam that's happened in some 15+ years there at Plutonic.
An expanded ROM pad so that we can hold these stockpiles that get talked about a lot more in the industry today. There's some wonderful operators in our industry that use stockpiles very effectively. I think many of you know their names, and we're hoping to emulate them, but in the underground space. Many of them do it very well in the open pit space, and we're hoping to really suffocate our mill. If you go back and look at that earlier slide, I'll come back to it at the end, if we can replicate that by building large stockpiles ahead of the processing plant, it will only go further to building stabilized cash flow, stabilized gold production going forward and defending against lower prices should they come at us. Focusing on the processing plant more directly, this is our setup.
It was built in 1990 by a fellow, Ron Hawkes, who really did understand how to build processing plants, and we've lived in his shadow ever since and how he set this out. You can see it's a very well laid out plant, and we've been spending quite a bit of money over the past year, and that will continue over the course of this year and really getting that throughput to where we would like it to be. A quick rundown of our deposits. The Trident deposit, we successfully completed the open pit. It's the first open pit that Catalyst has done as a team. We are a group of underground miners, as Mick Garbellini will attest. He's here today if you do see him. He's been a stalwart of the conference of ours and recruitment drive here and this week.
Again, thank you to Mick for all his efforts. What you see here on screen is really what he's been spending his time doing, pulling the Trident open pit together and then building out this decline. In the bottom right-hand corner, you can see some stopes that we'll hope to get to later this year, and he's currently pushing that decline drive there. On this work here, the discovery of this deposit when we came across this deposit was some 400,000 oz odd . It's Andrew Finch, who joins us here today, and his exploration team that has led the investment of that some AUD 130 million to take reserves up to one and a half million ounces. It's really been a wonderful success. I'll talk in a little bit about Cinnamon, another deposit that Andrew's team's had considerable success in.
This is really why we talk about the Plutonic belt as being one of the great belts of Western Australia. It sat there unloved for many, many years in foreign ownership hands. Really, the Trident deposit is emblematic of what we think can happen here at the Plutonic belt if we put our mind to it and putting the resources of Andrew Finch and Mick Garbellini together. We're very pleased to have this open pit out of the way and get into this underground, what we know best. Also there, Mick's been spending his time at Kaylor, a deposit discovered back in the 1990s by a famed geologist, Brett Kaylor. Really, it's been a hell of an effort to build out this underground. You can see there in red, and Mick's been pushing the team there to bring that online.
We did have our last quarter of really that ramp-up taking effect and those ounces contributing to that higher grade that I showed you earlier on the chart and the higher ounce production. Really, the strategy of the belt of six mines or four mines currently coming into the central processing plant, you can see that coming to the fore. Much of this work here is done by another fellow in the audience today that's with us. Ross Moger's been a key part of the business now for a couple of years. It's with him and another fellow, Anthony Buckingham, that's not with us here today, that have pulled these satellite projects together. That projects team really goes in and hands them over to Mick and his team. It's in Cinnamon here that we've had some real success. This is a deposit.
It really is quite a greenfields discovery below a previously known resource. You can see in the bottom left-hand corner behind Andrew's head there, the higher grade Cinnamon, high grade shoot that we've discovered over the last 12 months. We are looking forward to coming and putting out a study and showing how that fits into our 10-year, 200,000 oz plan. Very much some wonderful success there from Andrew and his team again. Old Highway, a quick recap. We are trying to bring that into production this year. It's a very similar model to what we have at Trident, so hopefully next year we're showing you a similar image as what we showed you with Trident with an open pit and a decline commencing. Hopefully, over the course of this year, Mick can deliver again as he's done so well for the past three years with us.
That's the rough outline of where we started in 2023. We've spent quite a lot of money trying to delineate these reserves, but we do think that's terribly important in order to get the bow wave out ahead of us of mine life. That bow wave really follows all the way through to production where we've invested. It does stay quite hidden, but all of our deposits have been grade controlled to a level that really hasn't been seen for many years. We've had to do that at Plutonic Main. We've had to get the bow wave of grade control drilling out at Plutonic East. We've done that at Trident, where we've drilled some 12- 18 months ahead of ourselves, and K2, the same. It's terribly important that we do that if we're going to have stable long-term cash flows.
We like to think that's part of what we can take away from these other wonderful operators that have proven themselves in the business and can apply it to our own selves here. That comes through in this slide. Catalyst is beginning to demonstrate its ability or beginning to earn its right as a mine developer. When we were here 12 months ago, we really only had Plutonic Main that was operational and first ore was coming out of Plutonic East. If we go 12 months further on, we've completed the Trident open pit. We've also completed the K2 ramp up. We've brought Plutonic East online. We've continued to operate out of Plutonic Main. It's a very complex amount of capital to digest there, a complex amount of operations to get working smoothly, and I think it's a real credit to the team.
That's not just Mick, but the team around him in order to get that all to move smoothly. We do think the message, as I said at the beginning of this presentation, just to recap, is about digesting capital. It is about exploration. Once we near the 2 million ounce target, we're going to see those exploration levels fall. As we get to bringing online those last two remaining projects of Old Highway and Cinnamon, we're going to see that capital requirement fall. As we get those one-off items like the power plant and the camp behind us, we're going to see that capital numbers fall. We do think Catalyst is transitioning. We went through a turnaround phase in 2023 where we had to make a loss-making asset profitable.
We needed to make an investment phase, which has been the last 12- 24 months. We're hopeful going forward there's going to be quite a lot less capital spent as we get into that perhaps termed harvest mode. Again, just recapping, coming back to the company on a page. We've got six deposits. You can see there the reserves of each of those deposits that you can look at in your own time. You can see the targeted mining rates that we've got there in our central processing facility. We hope Cinnamon, with that study coming online, will really allow us to suffocate that mill and take us well above the 2 million tons mined per annum. Achieving that 200,000 oz production target, we don't think is something that is in question, but rather just a matter of time.
Thank you very much for your time.