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Chest Collector is new item in Mr. Mine released at 4th June 2021. You can get Chest Collector at 100KM between 9th and 10th miner. It look like a pile of boxes and you just click on it to acquire the structure.

You can upgrade the storage and chance of Chest Collector from Craft Center up to level 10.

It works during offline progress and fills up while you AFK.

The chest collector doesn't store the type of chest it collects only the number of chests in it and it rolls the type when you collect them. So I think there's a chance your gold chest could be deleted, but also a chance all your basic chest rolls get a second chance to be a golden chest.

You can collect chests from Collector by Shortcuts shift+click.

Chest Collector Chance
Level Chance (%) Upgrade Cost
1 5
2 10 10 Building Materials, 15K Red Diamond
3 15 50 Building Materials, 20K Blue Obsidian, 200 Polonium2
4 20 150 Building Materials, 5M Californium, 150 Polonium3
5 25 250 Building Materials, 5M Californium, 5k Oil
6 30 350 Building Materials, 5M Californium, 75 Polonium3
7 35 500 Building Materials, 10M Carbon, 10K Nitrogen1
8 40 750 Building Materials, 10M Titanium, 500 Einsteinium1 , 50 Einsteinium2
9 45 1000 Building Materials, 1M Neodymium, 100 Einsteinium3
10 50 1500 Building Materials, 1M Ytterbium, 200 Einsteinium3 (Temp)
Chest Collector Capacity
Level Capacity Upgrade Cost
1 10
2 25 10 Building Materials, 15K Red Diamond
3 50 50 Building Materials, 20K Blue Obsidian, 200 Polonium2
4 100 150 Building Materials, 5M Californium, 150 Polonium3
5 150 250 Building Materials, 5M Californium, 5k Oil
6 200 350 Building Materials, 5M Californium, 75 Polonium3
7 250 500 Building Materials, 10M Carbon, 10K Nitrogen1
8 300 750 Building Materials, 10M Titanium, 500 Einsteinium1 , 50 Einsteinium2
9 350 1000 Building Materials, 1M Neodymium, 100 Einsteinium3
10 400 1500 Building Materials, 1M Ytterbium, 200 Einsteinium3 (Temp)
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