Assuming Cytosino produces 5 minerals per year, you get 10 years of production. Once the mine on the bonus mineral is complete (currently 7 years away), Cytosino can produce 9 minerals per year, so the alien artifact only adds 5 and a half years of production.
However, since we have crawlers, we have a several things that will speed up the secret project.
(1) Other bases can build crawlers.
(2) In SMAniaC, we can hurry crawlers for 2 credits per mineral (by switching to a facility, hurrying minerals and switching back).
(3) I'm not sure if we're at the point where we can upgrade crawlers for less than 2 credits per mineral.
(4) Cytosino builds crawlers toward a secret project. Until the crawler is cashed in, it can be used to harvest a mineral from a rocky or rolling square.
We don't have to make a decision immediately. We can keep the alien artifact in Cytosino until we're 50 minerals short of a secret project. Then we can cash it in or not as the situation warrants.
However, since we have crawlers, we have a several things that will speed up the secret project.
(1) Other bases can build crawlers.
(2) In SMAniaC, we can hurry crawlers for 2 credits per mineral (by switching to a facility, hurrying minerals and switching back).
(3) I'm not sure if we're at the point where we can upgrade crawlers for less than 2 credits per mineral.
(4) Cytosino builds crawlers toward a secret project. Until the crawler is cashed in, it can be used to harvest a mineral from a rocky or rolling square.
We don't have to make a decision immediately. We can keep the alien artifact in Cytosino until we're 50 minerals short of a secret project. Then we can cash it in or not as the situation warrants.
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