Danmark
You didn't state what country the coin is from, but an ore is 1/100 of a crown in the Scandinavian countries. However, regardless of which country, the value of their crowns is far less than $1 so a modern 25-ore coin is only worth somewhere between a nickel and a dime depending on where it came from.
The country of Denmark spells the name of its country "Danmark". The "ore" is the lower denomination coin of Denmark, spelled "Danmark" on their coins. One Krone equals 100 ore. Note that Denmark does not use the Euro, as does Germany and other countries to the south of Denmark.
Well, three different countries use the Ore as a denomination. Without more information I cannot tell which country minted your coin. Denmark: 1 Ore, 1876 $400USD in Fine Condition, $1500 in Uncirculated. Norway: 1 Ore, 1876 $5USD in Fine, $80 in Uncirculated. Sweden: 1 Ore, 1876 $25USD in Fine, $200 in Uncirculated. Remember, rarity and condition are key in coin values.
Well, "tretio ore" means "thirty ore" in Swedish. The number refers to how much ore is used in each coin, while the actual word "ore" is referring to the coin itself. The higher the number, the more costly the coin is. There are also "tjugo ore" (twenty ore) coins that I know of, and I'm sure there is more out there than just that. (Oh! And, as far as Google and I are concerned, there is nothing in existence that matches "trettio ore"!)
What date? What country? Unless the coin is old, it's probably not worth very much. 1 ore is 1/100 of a crown, and the crowns of each Scandinavian country have been worth much less than a dollar in recent years.
I do not know what the coin you mention is worth, but it has recently gone out of use. Noreg is not spelled wrong, it is the the norwegian name for my native country (Norway). steffenlj89@gmail.com
What you have is a Swedish 50 ore coin. One Swedish krona is 100 ore, but all ore coins have since been discontinued and demonetized. Based on current exchange rates (April 2018), it would be worth six cents in US dollars.
$2.94
about 5 cents
Its not a coin, it's a chocolate coin or bisque coin ore something. You will find it on the food store :-D
Yes! It is rock that is not ore, but surrounds the ore.
About 7¢