There are 6 mining ICOs that are either for sale right now or going to be on sale in the next few weeks. The 6 ICOs that I'm going to compare are:

Ambit Mining https://www.ambitmining.io/ Abrv- AMM

HashGains https://www.hashgains.com/ico/ Abrv- HASG

Ice Rock Mining https://icerockmining.io/en.html Abrv- IRM

Miner one https://www.minerone.io/ Abrv-MIO

Phi Gold https://phigold.co/ Abrv- PHG

Thorentium https://www.thorentium.com/EN/ Abrv- THOR

First we are going to look at what each ICO is giving you in the token they are offering:

IRM and MIO are offering lifetime contracts to token holders.

THOR is offering a lifetime contract but you have to purchase into mining pools.

AMM is listing as 5 years and is paying token holders so they might be lifetime as well but they don't specifically state that.

PHG you also buy a contract with your tokens for 2-4 years depending on the contract.

HASG you again buy a contract with your tokens for 2 years.

There is no telling how long any company will last in Crypto or how long mining will be profitable. However if you are considering buying mining ICOs I have to think you have a pretty positive outlook on the long term prospects of Crypto in general. I personally do believe Crypto is the future for a number of industries so I'm drawn to the lifetime contract tokens as they will keep on producing after the other contracts are gone.

Next lets look at the project ROI for each project. I will be using ~ values as they can only give those kind of numbers anyways. I will be using a figure of 1,000 usd to give an idea of the ROI after the write up of each token. One other caveat the tokens will be "bought" as I'm writing this so some of these coins will get the benefit of pre-ico/discount ico prices.

AMM is quoting a 171% ROI each year based on BTC holding steady at 13k a coin. This is important to note because many of the other tokens are including BTC price increase in their ROI %. So keeping what I just said in mind 1k usd gets you 2000 tokens (with btc staying steady at 13K) would give you ~$5,280 in a 3 year period.

HASG is a bit different, for every 10 tokens you buy 1GH/s of hashing power to mine either BTC or BCH. So right now 1k usd gives us 1250 tokens or 125GH/s for 2 years. So that is to low by any calculator I can find. There has to be something wrong with what their website and their white paper. Here is a sample they provide in their white paper: "Sample investment of 10,000 tokens during pre-sale will cost you $7,000 would also get 1,000 GH/s or 1 TH/s of hashing power for 24 months which can get you close to BTC 0.05 per year or 0.1 BTC in 2 years which is equivalent to around $2,000." That doesn't add up correctly to me so until that is made more clear I know I would steer clear of the HASG ICO.

IRM is claiming a 380% ROI which is pretty crazy high. They say this is because they are in an actual mountain mine so no need for cooling or for rent on a building. 1k usd gets you 1300 tokens. Their calculator has it set for 3 years in which it claims a $19,387 return. This is massively higher then the other two so far. They do have a BTC price increased baked into each month which the first two did not.

MIO is claiming a 188% ROI. For 1k usd you get ~ 2000 tokens. They also have their calculations pegged with BTC at a fixed price of 14k. After 3 years $6,280.

PHG is claiming a 300% ROI. It's a little odd the way it's structured imo. You can buy packages for 1k, 5k, 10k, and 50k. It kinda makes mention of buying lower priced mining but doesn't get into specifics. The packages themselves are interesting because they give you BITCOIN, DASH, ETHEREUM, LITECOIN, MONERO and ZCASH hash rates. So it would diversify your payouts to you immediately. This doesn't say any of these coins are pegged to a price so I would assume the ROI includes a monthly price increase on each coin. The 1k mining option is for 2 years. After 2 years $6000.

THOR is claiming a 28% ROI with a 75% increase on the first year with pre ico pricing. For 1k usd you get 2500 tokens that will make you $3220 over 3 years. This one lets you reinvest to receive greater payouts over time. If that is done the number goes up to $3,670 in 3 years.

The two outliers are HASG which I really have no idea about and THOR which does much better then HASG but far less then the others. Both of these projects are cloud mining so maybe that is why.

Ambit Mining and Miner one look to be the most professional and safest and are likely low risk to moderate risk imo. They both offer pretty good ROIs as well.

Ice Rock Mining is more medium risk imo. The fact that it's in a mountain cave has to come with some obstacles. It does offer an incredible ROI thou. I did invest in this one before I did this review. I am still happy with my choice.

Phi Gold also more medium risk. The limiting factor of the plans available and the way the plans are structured while interesting are just shorter then the above ICOs. It does boast a pretty health 300% ROI so it could still be a good investment I just see more positives in the above 3.

I'm undecided if I will buy into Ambit Mining and Miner one if I do I will post on this page saying so. I will link my referral link for Ice Rock Mining: https://icerockmining.io?stcref=6c4b1c30-8dd1-4193-b311-2c7c2ab3e7b3 if anyone found my analysis helpful and decides to invest into that particular ICO.

Final Note, I'm not your financial adviser please do your own research if you plan to invest in any of these ICOs. Hopefully you found this helpful and good luck guys.

IRM bitcointalk bountythread - https://bitcointalk.org/index.php?topic=2196095.0

IRM bitcointalk ANNthread - https://bitcointalk.org/index.php?topic=2176573.msg21879653#msg21879653